| Term | Definition |
|---|
| biome | a natural community of plants and animals, its composition being largely controlled by climatic conditions |
| tolerance | the ability of an organism to withstand fluctuations in biotic and abiotic environmental factors |
| microclimate | climate within a small area that differs significantly from the climate of the surrounding area |
| canopy | dense covering formed by the leafy tops of tall rain forest trees |
| understory | A layer of shorter plants that grow in the shade of a forest canopy. |
| deciduous | Trees and shrubs that shed their leaves at the end of the growing season |
| coniferous | term used to refer to trees that produce seed-bearing cones and have thin leaves shaped like needles |
| humus | material formed from decaying leaves and other organic matter |
| taiga | biome in which the winters are cold but summers are mild enough to allow the ground to thaw |
| permafrost | layer of permanently frozen subsoil in the tundra |
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