This question is rather vague, but there are many different things you can learn about Earth's history though the study of animals. For example: you can look at the fossils of dinosaurs and learn how they lived, their size, what era they were from, etc. If you are looking at live animals, you can determine how they live with the environment around them.
Answer:
idiom and simile
Explanation:
the first is obvious none of the other answers make sense and simile for the second because it compares the wind to a flat blade use like
in the future Elon musk can create a chip were we all become smart and don't have to go to school or work
