| A | B |
|---|
| biology | the study of living things |
| environment | the surroundings of living things |
| respond | to act or to do something because of a change in the environment |
| stimulus | a change in the environment that makes a living thing respond |
| magnifying glass | a lens that makes things look larger than they are |
| lens | glass that is curved |
| magnifying power | the number of times a microscope magnifies an object |
| macroscopic | large enough to be seen without a microscope |
| protozoa | microscopic animals |
| ameba | one of the protozoa that does not have a definite shape |
| paramecium | one of the protozoa shaped like a slipper |
| organism | a living thing |
| ecology | the study of organisms and their environment |
| carnivore | an animal that eats only meat |
| herbivore | an animal that eats only plants |
| omnivore | an animal that eats both meat and plants |
| natural resource | a useful thing found in nature |
| polluted | made harmful by added materials |
| pollution | adding harmful materials to water or air |
| stomates | tiny openings in plant leaves for taking in air |
| aerobic organism | an organism that needs air |
| anaerobic organism | an organism that can live without air |
| physical environment | the nonliving parts of the environment |
| temperature | a measure of how hot or cold something is |
| thermometer | an instrument for measuring temperature |
| life functions | the things an organism must do to stay alive |
| sap | a liquid that carries materials through plants |
| urine | a liquid waste produced by animals |
| growth | an increase in size |
| limewater | a colorless liquid used to test for carbon dioxide |
| blood vessels | tubes in the body that blood moves through |
| cobalt chloride paper | a paper that turns from blue to pink when water vapor touches it |
