| A | B |
|---|
| biological evolution | change over time in populations of related organisms |
| cast | fossil copy of an organism in a rock |
| extinction | when all individuals of a species have died |
| fossil record | set of all the fossils ever discovered on Earth |
| geologic time scale | chart that divides Earth’s history into different time units |
| mold | impression of an organism in a rock |
| trace fossil | preserved evidence of the activity of an organism |
| adaptation | characteristic of a species that enables the species to survive in its environment |
| camouflage | adaptation that enables species to blend in with their environments |
| mimicry | resemblance of one species to another species |
| natural selection | process by which populations of organisms with variations that help them survive in their environments live longer, compete better, and reproduce more than those that do not have the variations |
| naturalist | person who studies plants and animals by observing them |
| selective breeding | the breeding of organisms for desired characteristics |
| variation | slight difference in the appearance of individual members of a species |
| analogous structure | body part found in multiple species that performs a similar function but differs in structure |
| comparative anatomy | study of similarities and differences among structures of living species |
| embryology | science of the development of embryos from fertilization to birth |
| homologous structure | body part found in mulitple species that is similar in structure and position but different in function |
| vestigial structure | body part that has lost its original function |
