D. the number of mates on the island
their appearance changes cause different birds breeding together can make an impact of how the bird looks
The answer is B.
Sex cells are formed by a process called meiosis, not mitosis.
The part of the brain that performs that function is the hypothalamus.
Answer:
An index fossil is also known as guide fossils or indicator fossil. They are fossils used to determine and identify geologic periods.
The main characteristics of an index fossil include :
1.It must be distinctive.
2.It must be widespread.
3. It must be abundant
4. It must be limited in geologic time.
Due to trends and studies of most fossil-bearing rocks being formed in the ocean, the major index fossils are mostly marine animal or plant organisms.
They will run out. Because nonrenewable means it can't be renewed until like millions of year or so. Hope this helps and You're Welcome! :3