| A | B |
|---|
| acid rain | Moisture that falls to Earth after being mixed with wastes from burned fossil fuels. |
| adaptation | A characteristic of an organism that increases its chance of survival in its environment. |
| atom | The smallest unit of a chemical element that can still retain the properties of that element. |
| carnivore | An animal or plant that consumes or obtains nutrients from animals. |
| cell | The smallest structural unit of an organism that is capable of independent functioning, consisting of one or more nuclei, cytoplasm, and various organelles, all surrounded by a semi permeable cell membrane. |
| cell membrane | A thin layer of tissue, biological membrane (lipids) that separates the interior of the cell from the outside environment. |
| change of state | A physical change that occurs when matter changes to another state (i.e., liquid, gas, or solid). |
| chemical change | A reaction or a change in a substance produced by chemical means that results in producing a different substance. |
| chemical property | A property observed when a substance changes; characteristic of a substance that involves a chemical reaction. |
| chemical reaction | A reaction or a change in a substance produced by chemical means that results in producing a different chemical. |
| chlorophyll | A green chemical in plant cells that allows plants to use the Sun's energy for making food. |
| chromosome | A structure in all living cells that consists of a single molecule of DNA bonded to various proteins and that carries the genes determining heredity. |
| circulatory system | The bodily system consisting of the heart, blood vessels, and blood that circulates blood throughout the body, delivers nutrients and other essential materials to cells, and removes waste products. |
| commensalism | An association between two species in which one of pair benefits. |
| community | A group of people who live or work together in the same place. |
| competition | An interaction between organisms or species, in which the fitness of one is lowered by the presence of another. |
| compound | A substance made up of at least two different elements held together by chemical bonds that can only be broken down into elements by chemical processes. |
| conservation | The preservation and careful management of the environment and of natural resources. |
| consumer | A person who buys and uses goods and services. |
| cytoplasm | The jellylike material that makes up much of a cell inside the cell membrane, and, in eukaryotic cells, surrounds the nucleus. |
