| A | B |
|---|
| diurnal | active during the day |
| nocturnal | active during the night |
| hibernation | winter sleep during which all body activities slow down |
| estivation | summer resting state of an organism |
| water cycle | flow of water throught the environment |
| oxygen cycle | recycling of oxygen and carbon dioxide in the environment |
| carbon cycle | recycling of carbon dioxide and oxygen in the environment |
| nitrogen cycle | recycling of nitrogen in the environment |
| ecological succession | process of gradual change within a community |
| climax community | stable collection of plants, animals, and other organisms in a particular place |
