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Biology: The Origin of Life (Program 4)

33 minutes 32 seconds

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From fossil evidence, it appears that life may have existed on Earth as early as 3.5 billion years ago. This suggests that life must have evolved sometime during Earth's tumultuous first billion years. How did life evolve? What did early forms of life look like? Topics covered include protocells, endosymbiosis, prokaryotes, eukaryotes, evolution, heredity, variation, natural selection, genetic drift, and gene flow. Part of the "Biology" series.

Media Details

Runtime: 33 minutes 32 seconds

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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
A roughly tear-drop shaped object with a thin outer layer, a wider middle layer, and a central space. Caption: A gastrula is an embryo made of three cell layers.
Biology
Episode 5
21 minutes 47 seconds
Grade Level: 10 - 12
Illustration of a cell split in two that appears to be ready to eat something. Caption: T-Cells produce proteins that turn ordinary macrophages into killers
Biology
Episode 6
34 minutes 58 seconds
Grade Level: 10 - 12
Illustration of the carbon cycle: Plants intake CO2, herbivores (giraffe) eat plants, carnivores (lion) eat herbivores, carnivores release CO2, and then plants absorb CO2. Caption: releases carbon dioxide back into the air.
Biology
Episode 7
35 minutes 47 seconds
Grade Level: 10 - 12