HEREDITY & ADAPTATION Inv 1 Review

Which of the following best describes what we mean when we talk about the fossil record? (Mark the one best answer.)

• A. Leaf imprints found in hardened mud

• B. The history of fossils in the last 400,000 years

• C. A fossil found in rock

• D. All the fossils that have been discovered.

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Mark an X next to each statement that explains why the fossil record is considered incomplete.

• Not all organisms become fossils

• Some organisms have not been extinct long enough

• There were times when fossils didn’t form

• There are still fossils that haven’t been found

• Some organisms are too small to make fossils

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Write the letters of the fossil limbs in order from oldest (most ancient) to youngest (most recent)

• D,B,A,C

• D,B,C,A

• A,B,C,D

• B,D,C,A

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Explain how you know the order of evolution of the limbs from oldest to newest. Check all that apply.

• The one bone, two bone, many bones, digits concept

• Evolution can go both ways: fish to land animals or land animals to fish

• Some fish evolved over time changing their fins to limbs with digits

• The fossil record shows evidence of this pattern.

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Why do we find more fossils of organisms such as snails and vertebrates than organisms such as jellyfish?

• Because snails and vertebrates have hard shells or bones that fossilize more easily.

• Because jellyfish live in environments that do not support fossilization.

• Because snails and vertebrates are more abundant than jellyfish.

• Because jellyfish decompose too quickly to fossilize.

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Look at the image above. Fossils were discovered in five different layers of rock. Check each statement that is true.

• Fossils found in layer 5 are most likely older than fossils found in layer 4.

• The age of a fossil is the same as the age of the rock it is found in.

• Limestone appeared before sandstone.

• A fossil found in layer 2 would be older than a fossil found in layer 4.

• According to the principle of superposition, layer 1 represents the oldest rock.

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Fossils of limb structures provide evidence that ancient and modern tetrapods are related because:

• they show similar bone patterns.

• they are found in the same geographic locations.

• they have the same size and shape.

• they are from the same time period.

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The fossil record documents the___________ of life-forms throughout the history of life on Earth. Check each that apply.

• change

• diversity

• entire number

• extinction

• environment

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