Which of the following contributes to the growth of a population

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which measure of an earthquake depends on how close you are to the focus?