The location in which fossils appear in the sedimentary layers is used to piece together an evolutionary sequence of life on Earth called __________________________________.

What are some causes for extinction?

___________________ increase an organism’s chance of survival in their environment.

_____________________________ is a process by which organisms with favorable traits survive and reproduce more successfully.

_____________________________ is the process of how organisms acquire adaptations over time.

Why are there gaps in the fossil record?

_____________________________ is an organism from which others have descended.

As environmental conditions change over time, which population will have a better chance of survival?

Animals with backbones

_____________________________ is used by biologists to illustrate evolutionary relationships between organisms and their ancestors.

Do changes in the environment CAUSE mutations?

Greater _____________________________ signifies a larger variety of alleles, and therefore greater survivability of a species over time.