impact of humans on Earth. effect of gravity on animals. history of animal species on Earth. likelihood that dinosaurs will reappear.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: In 1971, the bones of an extinct flying dinosaur were discovered. This kind of discovery helps everyone learn more about
Possibilities:
- impact of humans on Earth.
- effect of gravity on animals.
- history of animal species on Earth.
- likelihood that dinosaurs will reappear.

history of animal species on Earth.