| A | B |
|---|
| Biological Evolution | A change over time in populations of related organisms |
| Cast | A fossil copy of an organism in a rock |
| Extinction | When all individuals of a species have died |
| Fossil Record | A set of all the fossils ever discovered on Earth |
| Geological Time Scale | A chart that divides Earth’s history into different time units |
| Isotope | Atoms of the same element that have different numbers of neutrons |
| Mold | An impression of an organism in a rock |
| Tissue | Similar cells that work together and perform a function |
| 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 | A 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 through evolution |
