C
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
In 1971, the bones of an extinct flying dinosaur were discovered. This kind of discovery helps everyone learn more about

### Choices:
A. impact of humans on Earth.
B. effect of gravity on animals.
C. history of animal species on Earth.
D. likelihood that dinosaurs will reappear.

### Answer:
