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Biology

Within Science

Ice cube being dropped into a glass of water. Spanish captions.

Closeup of a mottled brown spider. Caption: arachnids and crustaceans, have a skeleton on the outside

Two crabs facing off. Spanish captions.

Person looking into a microscope. Caption: (Zacharias) What do you do at the lab?

Two people walking down a hallway. Caption: we chat with DNA scientist Bruce Jackson,

Still image from: SciShow Kids: 3 Fun Facts About Bats

Still image from: SciShow Kids: Amazing Animal Groups

Still image from: SciShow Kids: Animal Slime and Other Weird Stuff

Still image from: SciShow Kids: Biologists--Scientists Who Love Life

Still image from: SciShow Kids: Busy Bees

Still image from: SciShow Kids: Camouflage--Animal Hide & Seek

Still image from: SciShow Kids: Cheetahs--The Fastest Runners in the World

Still image from: SciShow Kids: Fireflies--Nature's Baffling Blinkers

Still image from: SciShow Kids: Fungi--Why Mushrooms Are Awesome--Biology for Kids

Still image from: SciShow Kids: Getting Ready for Hibernation

Still image from: SciShow Kids: Glowing Ocean Animals

Still image from: SciShow Kids: How a Caterpillar Becomes a Butterfly

Still image from: SciShow Kids: How Do Ants Find Food?

Still image from: SciShow Kids: How Do We See Color?

Still image from: SciShow Kids: How Does a Seed Become a Plant

Still image from: SciShow Kids: Inspect an Insect

Still image from: SciShow Kids: Meet 3 Giant Insects

Still image from: SciShow Kids: Meet the Microanimals

Still image from: SciShow Kids: Meet Your Tonsils

Still image from: SciShow Kids: Nails--Your Human Claws

Still image from: SciShow Kids: Our Ancient Human Cousins

Still image from: SciShow Kids: Plants With Weapons

Still image from: SciShow Kids: Roar--Meet the Big Cats

Still image from: SciShow Kids: See Your Own Fingerprints

Still image from: SciShow Kids: Super Strong Dragonflies

Still image from: SciShow Kids: The Biggest Rodent

Still image from: SciShow Kids: The Science of Being Scared

Still image from: SciShow Kids: What Are Boogers?

Still image from: SciShow Kids: What Happens If You Swallow Gum?

Still image from: SciShow Kids: What's the Difference Between Fruits and Vegetables?

Still image from: SciShow Kids: Why Are Wet Dogs Smelly?

Still image from: SciShow Kids: Why Can't We Drink the Ocean?

Still image from: SciShow Kids: Why Do Animals Have Tails?

Still image from: SciShow Kids: Why Do Dogs Pant?

Still image from: SciShow Kids: Why Do I Feel Sick in the Car?

Still image from: SciShow Kids: Why Do I Get Wrinkly Fingers in the Bath?

Still image from: SciShow Kids: Why Do I Have Freckles?

Still image from: SciShow Kids: Why Do Kangaroos Have Pouches?

Still image from: SciShow Kids: Why Do Leaves Change Colors in the Fall?

Still image from: SciShow Kids: Why Do Onions Make Me Cry

Still image from: SciShow Kids: Why Do Squirrels Dig?

Still image from: SciShow Kids: Why Do We Dream?

Still image from: SciShow Kids: Why Do We Get Dizzy?

Still image from: SciShow Kids: Why Do We Get Goosebumps?

Still image from: SciShow Kids: Why Do We Get Hiccups?

Still image from: SciShow Kids: Why Do We Get Vaccines?

Still image from: SciShow Kids: Why Do We Have Belly Buttons?

Still image from: SciShow Kids: Why Do We Have Earwax?

Still image from: SciShow Kids: Why Do We Have Eyebrows?

Still image from: SciShow Kids: Why Do We Need Sleep?

Still image from: SciShow Kids: Why Do We Shiver?

Still image from: SciShow Kids: Why Does Hair Turn Gray?

Still image from: SciShow Kids: Why Does Spicy Food Taste Hot?

Still image from: SciShow Kids: Why Does Tickling Make Me Laugh?

Still image from: SciShow Kids: Why Don't Animals Need Sunscreen

Still image from: SciShow Kids: Why Don't Haircuts Hurt?

Still image from: SciShow Kids: Why Is My Leg Asleep?

Still image from: SciShow Kids: Why Should You Wear Sunscreen?

Still image from: SciShow Kids: Worms Are Wonderful

Still image from: SciShow: 3 Weird Things That Happen When You're Pregnant

Still image from: SciShow: A New Male Birth Control

Still image from: SciShow: Can You Really Be Scared to Death

Still image from: SciShow: Glowing Rats and Extreme Genetic Engineering

Still image from: SciShow: Invasive Species--The Story of Bunny

Still image from: SciShow: Pickles, Probiotics, and Why Rotten Food Is Good for You

Still image from: SciShow: Rosalind Franklin--Great Minds

Still image from: SciShow: The Agony of Motion Sickness

Still image from: SciShow: The Truth About Asparagus and Your Pee

Still image from: SciShow: What Happens if You Go Without Water

Still image from: SciShow: Why Are There Righties & Lefties?

Still image from: SciShow: Why Do We Kiss

Still image from: SciShow: Why No Giant Mammals

Still image from: Searching: Our Quest for Meaning in the Age of Science: The Stars & The Osprey

Illustration of a bear in snow. Caption: for the long winter's nap,

Pine Reproduction 101. Pine tree, a male pinecone, and a female pinecone. Female pinecones have a long protrusion from the center and pine needles around the edges. Caption: Each tree has female pine cones and male pine cones.

Raptors. Diagram of a raptor showing keen eyes, curved beak, talons, and a taste for prey. Caption: Raptors migrate south during the winter months

Illustration of a Venus flytrap with a fly caught in one of the traps. Caption: and the predatory carnivorous Venus flytrap, of course.

Person shaking seeds out of the head of a plant into their hand. Caption: Even the smallest seed contains everything needed to grow

Closeup of the human eye. Caption: which regulates the amount of light entering the eye.

Triangle divided into 3 horizontal sections, illustrating the Serengeti Ecosystem. The bottom section has an image of grass labeled Producers. The middle has an image of oxen labeled Herbivores. The top has an image of a lion labeled Predators.

A group of fish swimming together. Caption: of a submerged mountain forming enormous schools.

Closeup of a person's midsection. Person wears white and wraps their arms around themself. Title card reads, "Shedding light on heat, Episode 6. Heat and the human body."

Person holding the fossilized skull of an animal. Caption: but there's still a liveliness and a connection

Fossilized dinosaur skeleton still partially encased in rock displayed next to a model of the same dinosaur. Caption: Out of those, only a few are really prepared well.

Congo expedition of the American Museum of Natural History May 1909 to November 1915. Black and white photos of explorers with crocodile skulls and a map in the background. Caption: Those explorers had collected crocodile specimens

Three turtles, one with a tag around its neck. Caption: The turtles are all here together.

Illustration of a person standing on the shoreline next to a squid with a body larger than the person is tall. Caption: had just found a giant squid, and would I be interested?

Still image from: Short Takes With Naturalist Rudy Mancke: Alligator Skull

Still image from: Short Takes With Naturalist Rudy Mancke: Box Turtle Shell

Still image from: Short Takes With Naturalist Rudy Mancke: Calcite Crystals

Still image from: Short Takes With Naturalist Rudy Mancke: Carpenter Bee

Still image from: Short Takes With Naturalist Rudy Mancke: Cow Skull

Still image from: Short Takes With Naturalist Rudy Mancke: Pine Cones

Still image from: Short Takes With Naturalist Rudy Mancke: Polyphemus Moth Cocoon

Still image from: Short Takes With Naturalist Rudy Mancke: Rattlesnake Rattle

Still image from: Short Takes With Naturalist Rudy Mancke: Snapping Turtle Skull

Person in a white coat working in a science lab. Caption: Researchers are making genetically modified silkworms.

Coral in the water. Spanish captions.

Man with gray hair and a beard writes a math equation with chalk on a blackboard.

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,

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.

Closeup of a slug with arrows labeling its optical and sensory tentacles at the front, its mantle in the middle, and its keel towards the back.

Long grasses and shrubs. Caption: More than 100,000 natural compounds occur in plants,

Person holding a starfish and pointing to one of the arms. Caption: It was clear something was in the water,

Large fish with a spotted upper body and white underbelly swimming open-mouthed into a school of smaller fish. Caption: Each community is populated by different species.

Two women sit at a table outdoors. One looks down at a tarantula crawling in her hands while the other looks at us.

Still image from: Spot on Science: Catching Zzz's

Black and white image of a woman leaning over and peering into lab equipment. A man stands behind her.

Digital illustration of a colored map of North America. 4 white lines converge to form an arrow pointing a southern Mexico. Title card reads, "Monarch east fall migration."

Closeup of a slice of pumpkin pie with a dollop of whipped cream. A fork rests on the side of the pie plate.

Closeup of a crested gecko resting on a pair of hands. Title bar reads, "Crested geckos are native to the island country of New Caledonia, which is northeast of Australia."

Split screen of a deer standing in a snow flurry on left and a fox sitting in the snow on right. Text at bottom reads, "Winter coats."

Squid with a white body speckled in reddish brown. The color of the head matches the color of the speckles on the body. Caption: His brain has total control over what his skin is doing.

An orange starfish and orange anemone. Caption: the battle and the anemone rises to defend itself.

A hummingbird drinking nectar out of a flower.

Still image from: Super Animals: Amazing Acrobats

Still image from: Super Animals: Funky Fliers

Still image from: Super Animals: Super Speedsters

Still image from: Super Animals: Super Stealth

Still image from: Super Animals: Super Strength

Still image from: Super Animals: Team Players

Still image from: Super Animals: Weird Wonders

Still image from: Super Animals: X-Treme Adapters

Still image from: Super Animals: X-treme Predators

Close up of a frog's face and eyes. Caption: Now we are at 2,820 species of animals and plants.

A bright yellow fish with white stripes. Caption: to probe for worms, crabs and other hidden prey.

Molting tarantula lies on its back between webs as it sheds its skin.

Translucent white termites in the dirt. Caption: Termites are social insects,

Vials and other containers in a science lab. Caption: We've taken the cells out of the muscle tissue.

We look down at the edge of a tan tent that is secured in the sand.

Woman smiles up at us from beneath a bucket hat as she sits with her legs wrapped together in white fabric.

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."

Antivirals. A tablet of medication, an IV bag, and a vial with syringe.

Archaea.

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, "Asexual and Sexual Reproduction."

Digital illustration of a box with animals poking out. A flower, a leaf and 2 worms float around it. Box reads, "Heterotrophs. Hetero equals 'other.' Troph equals 'nourishment.' "

Split image showing cartoon characters with shields; breaking an object with a hammer; next to an apple core; in a container of yogurt; and fixing nitrogen atoms to the roots of a plant.

Cartoon of pink and purple amoebas smiling and gesturing with their hands. Title card reads, "Biological Levels."

Two cartoon characters. Biomagnification.

Cartoon of pink and purple amoebas smiling and gesturing with their hands. Title card reads, "Biomolecules."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Blood Types and Punnett Squares." And in parentheses, "Multiple Alleles."

Two cartoon characters. Carbon and Nitrogen Cycles.

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.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Cellular Respiration."

The Amoeba sisters present the heading, characteristics of life, with a D N A strand extending from left to right, below it.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Chromosome Numbers During Cell Division."

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."

Two cartoon characters. Classification.

Cartoon of a pink amoeba leaning to the side with its mouth open wide. Title card reads, "Codons."

Cartoon of a pink amoeba smiling and gesturing toward a title card that reads, "Dichotomous Keys with Scientific Names." Purple amoeba with surprised expression glances toward the title card from the opposite side.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Dihybrid Crosses."

Digital illustration of a double helix runs across the top and the bottom of the screen. Title card reads, "D, N, A Replication."

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.

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."

Two cartoon characters with a DNA strand. Ecological Relationships.

Two cartoon characters. Ecological succession.

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."

Purple cartoon amoeba holds a paintbrush and gestures toward a cartoon chalkboard that reads, "Enzymes." Pink cartoon amoeba smiles and gestures toward chalkboard on opposite side.

The Amoeba sisters present the heading, fermentation, with a D N A strand extending from left to right, below it.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Flower Reproduction in Angiosperms."

Food Webs, Energy Pyramids, and Intro to Biodiversity.

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, "Gel Electrophoreses."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Gene Regulation."

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."

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."

Two cartoon characters with a DNA strand. Homeostasis & Feedback.

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.

Two cartoon characters. Human Body Systems.

Cartoon of a group of amoebas. 2 hold shields and point spears. 1 shouts toward another. A green amoeba aims a bow and arrow. Another holds a bottle opposite a shouting amoeba wearing goggles. Title card reads, "Immune System."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Incomplete Dominance, Codominance, Polygenic Traits, and Epistasis."

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."

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 present the heading, introduction to cells.

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."

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."

Cartoon of 2 amoebas smiling and gesturing opposite one another. Title card at center reads, "Mitosis."

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."

A thought bubble for an amoeba sister reads, superpowers. Caption: Mutation.

The Amoeba sisters present the heading, natural selection.

The Amoeba sisters present the heading, osmosis and water potential, with a D N A strand extending from left to right, below it.

Cartoon of a purple amoeba holding a paintbrush and gesturing toward a chalkboard that reads, "Pedigrees." Pink amoeba smiles and gestures toward the chalkboard from the opposite side.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Photosynthesis."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Plant Structure and Adaptation."

The Amoeba sisters present the heading, specialized cells.

Cartoon of a frowning pink amoeba holding a folded piece of torn green paper. Large piece of folded green paper hovers to the side.

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."

Protists. Prokaryotes has an empty box. Eukaryotes has a box with an ovoid character containing a nucleus and with a tail.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Sex-linked Traits."

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 present the heading, specialized cells.

Two cartoon characters with a DNA strand. Speciation.

The Amoeba sisters present the heading, the cell cycle, with a D N A strand extending from left to right, below it.

Two cartoon characters with a DNA strand. Viruses.

The Amoeba sisters present a smiley character with a guitar. Caption: A T P.