| A | B | 
| herbivore | eats only plants | 
| carnivore | eats only animals | 
| omnivore | eats both plants & animals | 
| consumer | eats other organisms | 
| producer | makes its own energy | 
| food web | includes complex feeding relationships | 
| food chain | includes 1 simple feeding relationship | 
| population | same species in 1 area | 
| community | the various species in 1 area | 
| ecosystem | all living and nonliving things in 1 area | 
| biome | regional or global ecosystems | 
| detritivore | eats dead organic matter | 
| decomposer | returns organic material back to the environment | 
| biodiversity | the variety of living things in an ecosystem | 
| generalist | eats many types of food | 
| specialist | eats one or very few types of food | 
| biotic | living things in an ecosystem | 
| abiotic | nonliving things in an ecosystem | 
| keystone species | a species very important to its ecosystem | 
| ecology | the study of interactions among living things & their surroundings |