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Cells

Within Science
Lab equipment in background with illustration of DNA strand, question marks, and an arrow pointing to the horn on a unicorn. Caption: We'd want to know what parts of the genome make the horn.
#askMIT
Episode 2
2 minutes 46 seconds
Grade Level: 9 - 12
Computer rendering of red and green blobs, representing proteins, attached to a lipid bilayer. Caption. This protein, a G-protein, directs the production.
25 minutes 41 seconds
Grade Level: 7 - 12
Person sitting in front of a bookcase with books on various scientific subject. Caption: Microbes come in a huge variety of shapes--
Ask a Scientist About
Episode 3
4 minutes 44 seconds
Grade Level: 5 - 8
One central atom with two smaller atoms each attached to an electron on the outer ring of the central atom. Caption: covalently bonded to one oxygen atom,
Biology
Episode 1
40 minutes 43 seconds
Grade Level: 10 - 12
Metaphase. Diagram of two structures on opposite sides of a cell. Each structure has one blue chromosome and one red chromosome. Caption: of the chromatids, the chromosomes now line up
Biology
Episode 2
41 minutes 25 seconds
Grade Level: 10 - 12
Double helix strand of DNA with protein pairs on each step. For example, AT and CG. For each pair, one letter is smaller than the other. Caption: one large, and one small--
Biology
Episode 3
37 minutes 40 seconds
Grade Level: 10 - 12
A person speaking. Illustration of a lion and a flying insect. Natural Selection. Caption: says that those individuals with beneficial traits,
Biology
Episode 4
33 minutes 32 seconds
Grade Level: 10 - 12
Diagram showing two pairs of dogs resulting in two dogs, each with shorter legs. Caption: so dogs with shorter legs were selected and bred.:
Superlife
Episode 2
8 minutes 22 seconds
Grade Level: 10 - 12
Woman faces camera in a newsroom setting. Behind her, a screen reads, "Over 10 Different Diseases". Caption. It's over 100 different diseases.
22 minutes 14 seconds
Grade Level: 7 - 12
Bright green leaf and stem of a plant. Caption: During photosynthesis, energy from the sun,
20 minutes 58 seconds
Grade Level: 5 - 12
A diagram shows six cell parts. Nucleus, Nuclear Membrane, Cytoplasm, Mitochondria, Vacuoles, and cell membrane.
1 minutes 12 seconds
Grade Level: 7 - 12
ASL
Digital rendering of magnified cells floating in the dark. Text reads, “Cells.”
6 minutes 14 seconds
Grade Level: 4 - 8
Microscopic view of clusters of cells. Spanish captions.
15 minutes 15 seconds
Grade Level: 3 - 5
Closeup of nerve cells. Caption: Many nerve cells must transmit electrical impulses
15 minutes 13 seconds
Grade Level: 9 - 12
Very crowded market filled with people. Caption: They get this energy through respiration --
16 minutes 28 seconds
Grade Level: 9 - 12
Cellular respiration, the process of breaking things down. Eating the food.
1 minutes 3 seconds
Grade Level: 7 - 12
A hummingbird hovering around a plant.
6 minutes 3 seconds
Grade Level: 7 - 12
Microscopic view of pond water teaming with life. Text on image reads, "Core Biology. Microbiology and Genetics."
Core Biology
Episode 4
29 minutes 6 seconds
Grade Level: 10 - 12
Closeup of a huge pile of kernels of dried corn. Caption: making corn the number-one crop by weight.
Superlife
Episode 3
6 minutes 41 seconds
Grade Level: 10 - 12
ASL
Still image from: Crash Course Biology: Animal Development We're Just Tubes
Crash Course Biology
Season 0 / Ep 116
11 minutes 22 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: Circulatory and Respiratory Systems
Crash Course Biology
Season 0 / Ep 127
11 minutes 12 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: DNA Hot Pockets and the Longest Word Ever
Crash Course Biology
Season 0 / Ep 111
13 minutes 38 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: DNA Structure and Replication
Crash Course Biology
Season 0 / Ep 110
12 minutes 41 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: Eukaryopolis--The City of Animal Cell
Crash Course Biology
Season 0 / Ep 104
11 minutes 12 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: Meiosis Where the Sex Starts
Crash Course Biology
Season 0 / Ep 113
11 minutes 14 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: Membranes and Transport
Crash Course Biology
Season 0 / Ep 105
11 minutes 21 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: Mitosis Splitting Up Is Complicated
Crash Course Biology
Season 0 / Ep 112
10 minutes 26 seconds
Grade Level: 9 - 12
ASL
Still image from: Crash Course Biology: Plant Cells
Crash Course Biology
Season 0 / Ep 106
10 minutes 3 seconds
Grade Level: 9 - 12
Two parallel strands twisting around a central axis. Caption: Each strand is made up of a chain of nucleotides.
Visualizing Cell Processes
Episode 4
15 minutes
Grade Level: 9 - 12
Forest of large, towering trees. Caption: Well, redwood trees live for thousands of years,
14 minutes 40 seconds
Grade Level: 7 - 12
A woman leaning down to brush her lips on the head of a sleeping baby held in her arms. Caption: were passed on from generation to generation,
16 minutes 58 seconds
Grade Level: 9 - 12
Woman with shoulder-length brown hair parts her lips mid-speech in front of white bookshelves. Title card reads, "How Big Are Tree Genomes?"
6 minutes 57 seconds
Grade Level: 10 - 12
Illustration of a cell showing the cross section to expose the contents of the cell. Ribbon-like substance blankets the inner edge with spheres of various sizes suspended within. Caption: First, mitochondria take in molecules derived from food,
Inside The Living Cell
Episode 4
13 minutes 18 seconds
Grade Level: 8 - 12
Illustration of two cells with identical internal structures. Caption: are passed on to each new generation of cells,
Inside The Living Cell
Episode 5
14 minutes 11 seconds
Grade Level: 8 - 12
Illustration of beige spherical shapes and a single bright-green spiky shape. Caption: A virus is a lean, mean disease machine.
1 minutes 40 seconds
Grade Level: 7 - 12
Large spherical object surrounded by smaller multi-sphere objects. Nova Caption: Carbon is one of the most versatile elements.
1 minutes 37 seconds
Grade Level: 9 - 12
Two young people in a classroom setting, one looking through a microscope. Caption: - Hmm, ask her what her job in the cell is.
43 minutes 39 seconds
Grade Level: 5 - 9
Closeup of vibrant green leaves. Caption: that form a network throughout the plant structure.
20 minutes 17 seconds
Grade Level: 9 - 12
Illustration of two cells, one with spiky structures being overtaken by the other. Caption: how the body produces antibodies and T cells
21 minutes 19 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Amoebas--Occasional Brain-Eaters
Journey to the Microcosmos
Season 1 / Ep 18
10 minutes 25 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Death in the Microcosmos
Journey to the Microcosmos
Season 1 / Ep 11
7 minutes 20 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Desmids--The Symmetrical Algae That's Full of Crystals
Journey to the Microcosmos
Season 1 / Ep 29
8 minutes 52 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Diatoms--Tiny Factories You Can See From Space
Journey to the Microcosmos
Season 1 / Ep 8
7 minutes 43 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Gastrotrichs--Four Day Old Grandmothers
Journey to the Microcosmos
Season 1 / Ep 26
10 minutes 32 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: How Do Colonies Help Microorganisms Survive?
Journey to the Microcosmos
Season 1 / Ep 10
9 minutes 16 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: How Do Protozoa Get Around?
Journey to the Microcosmos
Season 1 / Ep 7
10 minutes 41 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: How Many Cells Are in a Microscopic Animal?
Journey to the Microcosmos
Season 6 / Ep 2
10 minutes 17 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Hydra--Stretchy, Speedy, & Probably Immortal
Journey to the Microcosmos
Season 1 / Ep 13
8 minutes 24 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Mysterious Jiggly Crystals and Other Intracellular Structures
Journey to the Microcosmos
Season 1 / Ep 9
11 minutes 30 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Relax and Enjoy the View
Journey to the Microcosmos
Season 1 / Ep 14
5 minutes 34 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Rotifers--Charmingly Bizarre & Often Ignored
Journey to the Microcosmos
Season 1 / Ep 16
9 minutes 18 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: The Colors of the Microcosmos
Journey to the Microcosmos
Season 1 / Ep 19
9 minutes 37 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: These Rotifers Glue Themselves Together
Journey to the Microcosmos
Season 6 / Ep 29
10 minutes 25 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: What If All the Microbes Disappeared?
Journey to the Microcosmos
Season 1 / Ep 28
10 minutes 24 seconds
Grade Level: 9 - 12
Still image from: Journey to the Microcosmos: Where Did Eukaryotic Cells Come From?
Journey to the Microcosmos
Season 1 / Ep 5
10 minutes 1 seconds
Grade Level: 9 - 12
Close up of a yellow Labrador dog on a leash. Caption: They are clones, copies of the same dog.
Superlife
Episode 1
9 minutes 16 seconds
Grade Level: 9 - 12
Hands adjusting a microscope. Spanish captions.
15 minutes 8 seconds
Grade Level: 3 - 5
A black, waist high horse wearing a bridle and halter is being held by a person standing next to it. Caption: the miniature horse has become a popular pet
Superlife
Episode 4
10 minutes 36 seconds
Grade Level: 10 - 12
Alex Dainis is seated in front of her book shelf. Animation of a cell structure. Caption: And this volume includes all of its organelles.
4 minutes 54 seconds
Grade Level: 10 - 12
Closeup of terraced moss on a hillside with water dripping from it. Caption: early land plants most likely lived in moist environments.
20 minutes 42 seconds
Grade Level: 9 - 12
Still image from: Origin of Everything: What Can We Learn From America's Last Epidemic?
Origin of Everything
Season 3 / Ep 20
11 minutes 52 seconds
Grade Level: 9 - 12
Illustration of a stalk of corn showing roots below ground and foliage above ground. Sun Light, CO2, and Sugar are above ground and Water is below ground. Caption: What vital gas is also given off in photosynthesis?
23 minutes 11 seconds
Grade Level: 10 - 12
Complex diagram showing ADP and Potassium on one side of a cell wall and ATP synthase moving through the cell wall to the other side. Caption: The enzyme uses energy from the backflow of hydrogen ions
Visualizing Cell Processes
Episode 3
14 minutes 59 seconds
Grade Level: 9 - 12
Illustration of the upper respiratory system. A tube extending from the top of the throat down into the chest is labeled as the trachea. Caption: The trachea is about 12 centimeters long
19 minutes 43 seconds
Grade Level: 9 - 12
Kaleidoscopic pattern primarily in blues and greens. Caption: I worked more and more on generating these images.
Artrageous With Nate
Season 0 / Ep 9
6 minutes 14 seconds
Grade Level: 7 - 12
Computer model of spiral ribbon structures with hollow, hexagonal tubular structures. Caption: (male narrator) What's the best was to know a protein?
Science Nation
Episode 132
2 minutes 33 seconds
Grade Level: 10 - 12
Graphic of light and dark blue spheres of various sizes. Caption: The food molecules fuel cellular respiration.
Science Video Vocab
Episode 108
2 minutes 40 seconds
Grade Level: 9 - 12
Person in a white coat working in a science lab. Caption: Researchers are making genetically modified silkworms.
Superlife
Episode 5
5 minutes 45 seconds
Grade Level: 10 - 12
Cross section of a cell with various organelle encased in a clear fluid. Cytosol. Caption: a gel-like fluid made up of mostly water, proteins,
23 minutes 40 seconds
Grade Level: 5 - 9
Diagram of a cell with spherical objects in the middle. Each object has a clear ring around the exterior. Caption: In eukaryotes, a cell nucleus protects the DNA.
3 minutes 43 seconds
Grade Level: 7 - 12
Vials and other containers in a science lab. Caption: We've taken the cells out of the muscle tissue.
Superlife
Episode 6
5 minutes 6 seconds
Grade Level: 10 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Alleles and Genes."
The Amoeba Sisters
Episode
8 minutes 37 seconds
Grade Level: 7 - 12
Cartoon of pink and purple amoebas smiling and gesturing with their hands. Title card reads, "Biological Levels."
The Amoeba Sisters
Episode
6 minutes 10 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba holding a paintbrush and gesturing toward a chalkboard that reads, "Cell Transport." Pink amoeba smiles and gestures toward the chalkboard from the opposite side.
The Amoeba Sisters
Episode
9 minutes 13 seconds
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Cellular Respiration."
The Amoeba Sisters
Episode
10 minutes 21 seconds
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Chromosome Numbers During Cell Division."
The Amoeba Sisters
Episode
6 minutes 25 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Chromosomes and Karyotypes."
The Amoeba Sisters
Episode
9 minutes 24 seconds
Grade Level: 7 - 12
Two cartoon characters. Classification.
The Amoeba Sisters
Episode
8 minutes 46 seconds
Grade Level: 7 - 12
Cartoon of a pink amoeba leaning to the side with its mouth open wide. Title card reads, "Codons."
The Amoeba Sisters
Episode
11 minutes 37 seconds
Grade Level: 7 - 12
Digital illustration of a double helix runs across the top and the bottom of the screen. Title card reads, "D, N, A Replication."
The Amoeba Sisters
Episode
11 minutes 18 seconds
Grade Level: 7 - 12
The molecular structure of D N A and R N A are depicted. Or The D N A double helix structure has two phosphate deoxyribose chains with the nucleotide bases are single bonded to it. The R N A single helix structure has a single phosphate deoxyribose chain with nucleotide bases attached to it.
The Amoeba Sisters
Episode
6 minutes 30 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "D, N, A, Chromosomes, Genes and Traits."
The Amoeba Sisters
Episode
8 minutes 47 seconds
Grade Level: 7 - 12
Purple cartoon amoeba looks up at a spiraling double helix while a pink cartoon amoeba looks toward the viewer on opposite side. Title card reads, "Endosymbiotic theory."
The Amoeba Sisters
Episode
5 minutes 46 seconds
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Gene Regulation."
The Amoeba Sisters
Episode
6 minutes 27 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Genetic Drift."
The Amoeba Sisters
Episode
5 minutes 9 seconds
Grade Level: 7 - 12
Digital illustration of the heads of 2 men labeled, "Godfrey Hardy" and "Wilhelm Weinberg." Title card at center reads, "Hardy-Weinberg Equilibrium. A population's allele and genotype frequencies are constant, unless there is some type of evolutionary force acting upon them."
The Amoeba Sisters
Episode
9 minutes 35 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba holding a paintbrush and gesturing toward a chalkboard that reads, "How Cells Specialize." And in parentheses below, "Featuring Stem Cells." Pink amoeba smiles and gestures toward chalkboard on opposite side.
The Amoeba Sisters
Episode
7 minutes 46 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks upwards at helix from the opposite side. Title card reads, "Inside the Cell Membrane."
The Amoeba Sisters
Episode
11 minutes 48 seconds
Grade Level: 7 - 12
Cartoon of a blue amoeba poking an irritated orange amoeba with an arrow that reads, "Intercellular to intracellular" that points to a frowning orange amoeba. Another blue amoeba stands next to an arrow that reads, "Intracellular to intercellular" and points to a blue amoeba poking an orange amoeba. Title card reads, "Signaling."
The Amoeba Sisters
Episode
9 minutes 34 seconds
Grade Level: 7 - 12
The Amoeba sisters present the heading, introduction to cells.
The Amoeba Sisters
Episode
9 minutes 37 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Meiosis."
The Amoeba Sisters
Episode
9 minutes 54 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Mitosis Versus Meiosis."
The Amoeba Sisters
Episode
7 minutes
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and gesturing opposite one another. Title card at center reads, "Mitosis."
The Amoeba Sisters
Episode
9 minutes 49 seconds
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Monohybrid Crosses or, in parentheses, Mendelian Inheritance from Genetic Series, Video 1."
The Amoeba Sisters
Episode
7 minutes 30 seconds
Grade Level: 7 - 12
A thought bubble for an amoeba sister reads, superpowers. Caption: Mutation.
The Amoeba Sisters
Episode
7 minutes 13 seconds
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Photosynthesis."
The Amoeba Sisters
Episode
8 minutes 15 seconds
Grade Level: 7 - 12
The Amoeba sisters present the heading, specialized cells.
The Amoeba Sisters
Episode
5 minutes 27 seconds
Grade Level: 7 - 12
Cartoon of a frowning pink amoeba holding a folded piece of torn green paper. Large piece of folded green paper hovers to the side.
The Amoeba Sisters
Episode
8 minutes 2 seconds
Grade Level: 7 - 12
Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Protein Synthesis."
The Amoeba Sisters
Episode
9 minutes 53 seconds
Grade Level: 7 - 12
Protists. Prokaryotes has an empty box. Eukaryotes has a box with an ovoid character containing a nucleus and with a tail.
The Amoeba Sisters
Episode
8 minutes 49 seconds
Grade Level: 7 - 12
Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Sex-linked Traits."
The Amoeba Sisters
Episode
7 minutes 2 seconds
Grade Level: 7 - 12
Digital illustration of a sodium potassium pump with a brown cell wall and purple pump at the center. Title card reads, "Sodium Potassium Pump."
The Amoeba Sisters
Episode
8 minutes 5 seconds
Grade Level: 7 - 12
The Amoeba sisters present the heading, specialized cells.
The Amoeba Sisters
Episode
9 minutes 10 seconds
Grade Level: 7 - 12
The Amoeba sisters present the heading, the cell cycle, with a D N A strand extending from left to right, below it.
The Amoeba Sisters
Episode
9 minutes 19 seconds
Grade Level: 7 - 12
The Amoeba sisters present a smiley character with a guitar. Caption: A T P.
The Amoeba Sisters
Episode
5 minutes 51 seconds
Grade Level: 7 - 12
Clustered tubular shapes. Caption: up to one million times their original size.
20 minutes 46 seconds
Grade Level: 5 - 12
Microscopic view of brick-like cells with red nuclei. Caption: this is a one-cell-think section of a growing onion root-
Inside The Living Cell
Episode 1
14 minutes 10 seconds
Grade Level: 8 - 12
Color illustration of the human cardiovascular system, showing the heart, arteries, and veins in the chest area.
25 minutes
Grade Level: 9 - 12
Person with their palms scraped and mildly bloody. Caption: The body acts quickly to stop excessive blood loss.
13 minutes 38 seconds
Grade Level: 4 - 8
Closeup of the outside of a human brain. Caption: It's here that we take a flow of nerve impulses
The Living Body
Episode 16
27 minutes 32 seconds
Grade Level: 9 - 12
ASL
Magic school bus floating in a cavern lined with red, finger-like structures. Caption: (Wanda) And those things out there are the villi.
The Magic School Bus
Season 4 / Ep 406
25 minutes 54 seconds
Grade Level: 2 - 6
Magnified view of red, spherical objects. Caption: Then he tested for the sickle cell character.
The Making Of The Fittest
Episode 3
14 minutes 3 seconds
Grade Level: 10 - 12
Blood cells flowing through a vein. Spanish captions.
The Making Of The Fittest
Episode 7
14 minutes 6 seconds
Grade Level: 10 - 12
Close up of a small, spiny, translucent fish. Caption: The fish absorb enough oxygen from the sea
The Making Of The Fittest
Episode 2
13 minutes 9 seconds
Grade Level: 10 - 12
Parallel lines of oval objects form a wall bridged by tendril like structures. Floating on either side of the wall are spherical objects. Caption: for larger molecules to get through.
Inside The Living Cell
Episode 2
13 minutes 53 seconds
Grade Level: 8 - 12
Brightly colored fish swimming around coral. Spanish captions.
14 minutes 41 seconds
Grade Level: 3 - 5
Illustration of a woman riding the bow of a ship and holding tulips while a throng of people stand beneath her. Caption: Some call this the first bubble economy.
Superlife
Episode 7
9 minutes 22 seconds
Grade Level: 10 - 12
Several large fish swimming in the water, as seen from the deck of a ship. Caption: Three thousand bluefins are farmed here.
Superlife
Episode 8
7 minutes 12 seconds
Grade Level: 10 - 12
Microscopic view of small, tube-like structures. Caption: Two kinds of cells make up the living world:
15 minutes 44 seconds
Grade Level: 9 - 12
ASL
Still image from: What Are Cnidarians?
4 minutes 41 seconds
Grade Level: 4 - 8
ASL
Still image from: What Are Porifera?
4 minutes 50 seconds
Grade Level: 4 - 8
Illustration of a tube with some internal structures and a rod through the center. Caption: When you make the generator turn,
Elementary Energy
Season 0 / Ep 3
10 minutes 33 seconds
Grade Level: 4 - 6
Person walking through stacked rows of chickens in cages. Caption: This is the age of the designer egg.
Superlife
Episode 9
6 minutes 24 seconds
Grade Level: 10 - 12
Diagram of human upper body with heart, lungs, and circulatory system visible. Caption: such as the respiratory system
10 minutes 45 seconds
Grade Level: 2 - 6
People sitting in a cafeteria eating. Sign on the wall says, "Fire Safety" Caption: It helps you live a normal life without having to worry
28 minutes 21 seconds
Grade Level: 10 - 12
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