| A | B |
|---|
| Abiotic Factors | Nonliving parts of an ecosystem. |
| Adaptation | An inherited trait that increases an organism's chance of survival and reproduction in a certain environment. |
| Biotic Factors | Living part of an ecosystem. |
| Coevolution | Two or more species evolving in response to each other. |
| Commensalism | Relationship between two species in which one species benifits and the other is neither harmed nor helped. |
| Community | A group of interacting populations of different species. |
| Competition | The relationship between species that attempt to use the same limited resources. |
| Ecosystem | All living organisms in a certain area as well as their physical environment. |
| Evolution | Change in the genetic characteristics of a population from one generation to the next. |
| Extinction | The irreversible disappearance of a population or a species. |
| Habitat | Place where an organism lives. |
| Host | Organism from which a parasite takes its nourishment. |
| Mutualism | A relationship between two species in which both benefit. |
| Natural Selection | Term used to describe the unequal survival and reproduction of organisms that results from the presence or absence of particular inherited traits. |
| Niche | An organism's way of life. |
| Organism | An individual living thing. |
| Parasites | Organism that lives in or on another organism and feeds on it without immediately killing it. |
| Parasitism | The relationship between a parasite and its host. |
| Population | A group of individuals of the same species living in a particular place. |
| Predation | The act of killing and eating another organism. |
| Predator | Organism that kills and eats another organism. |
| Prey | Organism that is killed and eaten by a predator. |
| Species | A group of organisms that are able to produce fertile offspring and that resemble each other in apperance, behavior, and internal structure. |
