| A | B |
|---|
| biomass | mass of living material produced by a given area |
| carnivore | organism that eats only animals |
| competition | struggle among organisms for an essential factor that is in short supply in the environment. |
| commensalism | relationship in which one organism benefits and the other one is not helped or harmed. |
| ecological pyramid | illustrated pyramid representing layers of energy relationships between organisms in an ecosystem. |
| epiphyte | a plant which grows on the outside of another plant without taking nurishment from that plant. |
| decomposer | Organism that breaks down dead organisms and returns this material to the soil. |
| food chain | The passing of materials and energy from one organisms to another. |
| food web | Illustration of interrelationships between food chains in an ecosystem. |
| herbivore | Organism that eats only plants. |
| independent organism | organism that exists without the aid of other members of the same species. |
| mutualism | relationship that is beneficial to both organisms involved. |
| omnivore | organism that eats plants and animals. |
| predator | animals that feed on other animals |
| prey | animals that a predator eats. |
| scavenger | animal that eats dead or decaying matter. |
| social insect | Insect that lives in a colony |
