What was the significant about the rocks darwin found in the mountains

What are two reasons for why a species might disappear from the fossil record?

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Asap. this question is 100 points if you answer it question: describe the basic relationship between ocean depth and temperature seen in the graph