| A | B |
|---|
| predator | an organism that hunts and kills other animals for food |
| prey | the animals that predators hunt |
| gills | special structures that allow fish and amphibians to breathe under water |
| friction | a force that slows the motion of moving objects |
| conductor | a material that easily moves electrical energy |
| gravity | a force that pulls objects back to earth |
| magnetism | the force around a magnet |
| reproduce | to make more of the same kind |
| organism | any living thing |
| life cycle | a continuous circle that shows all stages of life |
| environment | the conditions where an organism lives |
| revolution | the movement of an object around another object |
| rotation | the movement of an object around a central axis |
| melting point | the temperature at which matter changes from a solid to a liquid |
| freezing point | the temperature at which matter changes from a liquid to a solid |
| matter | anything that takes up place |
| chemical change | a change in matter that produces a different kind of matter |
| physical change | a change in matter that changes how the matter looks, but doesn't turn it into a different type of matter |
| vertebrate | an animal with a backbone |
| invertebrate | an animal without a backbone |
| chlorophyll | the substance in plants that gives them their green color |
| force | a push or pull on an object that causes it to change direction or speed |
| pollinator | an organism that transfers pollen from one flower to another |
