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1970s: Cartoon caveman carries club and sabertooth cat, looks at vulture on log bridge. Vulture flies down canyon. Man drinks from jug, imagines large road bridge, walks across bridge.
1970s: Frogs rest on water. Frog hops off rock. Frogs rest on rock. Salamander rests on stick by water.
United States CIRCA 1960s: Tapeworm specimen on a red background
1960s: Small bird sits on barbed wire. Boys talk and look at identification book. Illustration of bluebird in book. Finger points to description in book. Bluebird sits in tree and sings.
United States CIRCA 1980s: Girl and boy sit next to pool and put feet in water. Hormones excrete from pituitary gland. Pituitary glands and reproductive organs glow in silhouette of bodies.
United States CIRCA 1970s: Close up, tilt down plant roots. Magnified view of plant cells. Illustration of plant cells, zoom in. Close up shots of frog. Frog jumps in water. Frog in water.
1970s: Tadpole rests on stick. Tadpoles and froglets rest on plants. Frogs.

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3432041571

Stock Video ID: 3432041571

United States CIRCA 1950s: Earthworm in dirt. Illustration of group of animals without backbones [invertebrates]. Illustration of a group of animals with backbones .

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