| A | B |
| habitat | the specific environment where an organism lives |
| ecosystem | all the populations of organisms and the nonliving things in a environment, and the interaction among them |
| species | a group of organisms that produce offspring like themselves |
| population | all the organisms of the same species that life in the same area at the same time |
| community | populations of different species that live in the same area at the same time |
| biome | one of the six major land areas of the world that is home to specific plant and animal populations and is defined by its climate |
| drought | a period of very little rainfall |
| flood | an overflow of water onto land that is normally dry |
| thrive | to grow in a strong and healthy way |
| perish | to die |
| living element | a part of an ecosystem that requires energy to survive and has basic needs that must be met |
| nonliving element | a part of an ecosystem that does not require energy to survive and does not have basic needs like food and water |
| adaptation | an inherited trait or learned behavior that helps an organism survive in its surroundings |