Module D Evolution

Who was Charles Walcott and what did he discover?

• An American Paleontologist

• He discovered well-preserved fossils of ancient sea organisms

• His discovery was made in the Burgess shale near Mount Burgess,Canada

• The fossils were of soft bodied organisms

• Scientists used 2 methods to date the fossils at over 500 million years old

Scientists used __________ atoms to date things that used to be living. (Hint: the most common element in living things)

What was the Cambrian Explosion? (Hint: Vocab)

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6. What evidence from the fossil record supports the observation that life changes over time? Select all that apply.

• More fossils of the same species found in several rock layers

• increased numbers of fossils of different species found in younger rock layers

• several rock layers that do not contain fossils

• fossils of distant relatives of modern species found in ancient rock layers

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As you get closed to modern time, the complexity of fossils _________________.

• Increases

• Decreases

• Stays the same

• Changes rapidly

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What is a transitional fossil?

(Hint: Vocab)

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8. What other changes over time would be needed for fish to live out of the water?

(pg. 32 for full question)

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9. Biological structures often have shapes (form) that enable organisms to perform particular tasks (function).

How do transitional fossils, such as Tiktaalik, show that form is connected to function in living things?

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10. Hind legs are connected to pelvic bones, which are important for walking. Modern wales have relatively small pelvic bones.

Construct an explanation for how the pelvic bones of whales' ancestors changed over time.

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11. The form of a body structure is related to its function. Given this, how can you tell that Pakicetus inachus most likely lived on land and Dorudon atrox lived in water?

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