This document summarizes key concepts in ecology including:
1) Organisms include plants, animals, bacteria and fungi. A population is a group of the same species in an area. A community includes all populations in an area that depend on each other.
2) A biome is a large ecosystem with the same climate and organisms, such as forests, deserts, tundra, etc. A habitat is the environment an organism lives in including soil, air, water and plants. A niche is an organism's role, such as a spotted owl's role as a hunter.
3) Energy and nutrients cycle through food chains, webs, and pyramids from producers to consumers to decomposers. Key
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