| A | B |
|---|
| Biotic factor | living organisms in a system |
| Abiotic factor | non-living organisms in a system |
| Carrying capacity | number of resources that an environment can support |
| keystone species | organism that has an unusually large effect on its ecosystem |
| trophic levels | level of nourishment in a food chain |
| secondary consumer | carnivore that eats herbivores |
| primary consumer | herbivore |
| tertiary consumer | carnivore that eats other carnivores |
| quaternary consumer | apex predator |
| detritivore | eats dead things |
| producer | autotroph |
| consumer | heterotroph |
| energy pyramid | diagram comparing trophic levels |
| limiting factors | environmental factor that limits the growth and size of a population |
