| A | B |
|---|
| environment | the surroundings in which an organism lives, and includes both living and nonliving things |
| ecology | the study of the interaction between organisms and their environment |
| ecosystem | all the living and nonliving things that interact within certain area |
| cycle | a periodically repeated sequence of events |
| water cycle | the process by which water moves back and forth between Earth's surface and the atmosphere |
| carbon cycle | the process through which plants and animals exchange carbon in the form of sugar and carbon dioxide |
| herbivore | a plant-eating animal |
| omnivore | an animal that eats both plants and animals |
| predator | an animal, such as a lion, that must hunt and kill for food |
| prey | an animal the predator (for example, the lion) hunts |
| scavenger | an animal, such as a vulture, that eats the remains of dead animals |
| carnivore | an animal that eats both plants and animals |
