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| Ecology | The study of biology that deals with the interactions between living organisms and their environment. |
| Biotic Factors | All living organisms in the environment and their effects. |
| Abiotic Factors | Nonliving factors in an environment that affect the living organisms. Includes water, oxygen, light, etc. |
| Pyramid of Biomass | A relationship between the relative mass of organims at each feeding level needed to support the subsequent levels shown in a pyramid. |
| Pyramid of Energy | The amount of energy available in an ecosystem is shown with producers on the bottom and consumers on the subsequent levels. |
| Ecosystem | A community and the abiotic factors or physical environment in which they live. |
| Autotrophs | Organisms that can make their own organic food from nonorganic materials in the environment. |
| Heterotrophs | Organisms that can not make their own food but must ingest, digest, and egest preformed organic material. |
| Herbivores | Heterotrophs that feed on plants. |
| Carnivores | Heterotrophs that feed on other animals. |
| Predators | A type of carnivore that that attack and kill their prey. |
| Scavengers | A type of carnivore that feed on dead animals. |
| Omnivores | Heterotrophic animals that feed on both plants and animals. |
| Saprobes | Heterotrophs that obtain nutrients by breaking down the remains of dead plants and animals. |
| Food Web | All of the food chains in one ecosystem. |
| Food Chain | A series of organisms through which food energy is passed. |
| Decomposer | Saprobes. |
| Consumer | Heterotrophic organisms. |
| Producer | Autrotrophic organisms. |
