| A | B |
|---|
| biotic factor | A living part of an ecosystem. |
| abiotic factor | A nonliving part of an ecosystem |
| ecosystem | The living and nonliving things in an environment, and all of their interactions. |
| habitat | The home of an organism. |
| population | All of the members of a single type of organism in an ecosystem. |
| community | All the populations in an ecosystem. |
| biome | One of Earth's large ecosystems, with its own kind of climate, soil, and living things. |
| grassland | A biome where grasses are the main plant life. |
| deciduous forest | A biome with many kinds of trees that lose their leaves each auturm. |
| tropical rain forest | A hot, humid forest biome near the equator, with much rainfall and a wide variety of organisms. |
| desert | A sandy or rocky biome with very little rainfall. |
| taiga | A cool forest biome of conifers found in the upper northern hemisphere. |
| tundra | A large, treeless biome where the ground is frozen all year. |
| adaptation | A trait that helps one kind of living thing survive in its environment |
| hibernates | To rest or sleep through the cold winter. |
| camouflage | An adaptation by which an animal can hide by blending in with its surroundings. |
| mimicry | An adaptation in which one kind of organism has similar traits to another. |
| stimulus | Plural form that means something in the environment that causes a living thing to react. |
| tropism | The reaction of a plant to a stimulus. |
| accommodation | An individual organism's response to changes in its ecosystem. |
| endangered | Close to becoming extinct; having very few of its kind left. |
| extinct | Said of an organism no longer alive on Earth. |
