7th Grade Science Student ebook

11.1 EVIDENCE FOR EVOLUTION

CHAPTER 11: EVOLUTION

11.1 Section Review

1. What are adaptations? Give an example of an adaptation.


2. For each organism, name one adaptation and its function.


3. Use the words evolution and ancestor in a sentence.


4. Name one reason scientists believe that all life evolved from a
   single common ancestor.


5. Match the organism with its place on the cladogram
   (Figure 11.7). Explain the reasoning behind your placement.


6. How do similarities in the bones of humans, dolphins, horses,
   and birds provide evidence for evolution?


7. How is DNA evidence used to show evolutionary relationships?


8. The diagram (right) shows different
   fossil layers. Match each layer with the
   ages of the fossils that would be found
   there.
   a. 150 million years ago
   b. 140 million years ago
   c. 120 million years ago


9. Explain why there are gaps in the fossil
   record.

Figure 11.7: Use the diagram above

to answer question 5.