Which of the following is NOT a unit of time on the Geologic Time Scale?

Which of the following can become fossils?

Which of the following shows ONLY the external parts of an organism?

Which of the following could become a fossil?

When all members of a species have died off, the species is _______.

How do scientists use the fossil record?

Why is the fossil record incomplete?

Which of the following can scientists NOT interpret by examining fossils?

Many scientist think that *mass* extinctions were caused by _______ .

Which part of the body is LEAST likely to become a fossil?

Small changes in organisms over time that add up to big changes are referred to as:

Which of the following scientists is given credit for the theory of evolution and natural selection?

Organisms that are able to mate with one another are called ____.

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