| A | B |
| Protist | an organism that is not an animal, plant, fungus, or bacterium |
| Protozoan | a protist that has some similar characteristics as animals |
| Abiotic factors | the nonliving things in an environment |
| Biotic factors | the living things in an environment |
| Biosphere | all of the organisms living on the Earth, along with the soil, water, and air that they live in |
| Ecosystem | a group of organisims in a certain place their non-living environment |
| Community | all of the living things in an ecosystem |
| Population | a group of organisms of the same species that live in a community |
| Food Chain | the food and energy links in an ecosystem |
| Producer | an organism that makes its own food |
| Herbivore | an animal that eats plants |
| Carnivore | an animal that eats other animals |
| Scavenger | an animal that eats dead animals |
| foodweb | the network of food chains in an ecosystem |