Can someone please help me out? Biology - DNA

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

What is the following best defines climate?

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism