| A | B |
| animal-eater | an animal that uses other animals as food source |
| bacteria | group of microscopic organisms |
| BTB | bromthymol blue-a dye that indicates an alkaline or acidic solution |
| carbon dioxide | a colorless, odorless gas contained in the atmosphere |
| carbonic acid | a waek acid formed from carbon dioxide in water |
| carnivore | an organism that eats flesh, or meat |
| community | populations of plants and animals living in the same area & usually dependent on one another for food |
| condensation | the conversion of a material from the gaseous to the liquid state |
| consumers | animals in a community that eat plants or animals. |
| decay | the breakdown of organic matter due to the digestive action of microorganisms such as molds & bacteria |
| deciduous forest ecosystem | areas of the eastern US that consist mainly of threes that shed their leaves in the winter |
| decomposers | organisms in a community that cause decomposition or organic matter |