Across
- 4. smallest particle that can still be identified as the original matter it came from
- 6. system/ contains the heart, the blood vessels, and the blood
- 7. fifth step in the scientific method, along with communicating the results
- 10. measure of how easily a substance will burn or combine rapidly with oxygen
- 11. /a tool that measures the amount of matter in an object
- 12. substance made up of two or more different elements that have been chemically combined
- 13. basic unit of structure and function in living things
Down
- 1. measure of how closely packed an object’s atoms are
- 2. fourth step in the scientific method; doing the experiment
- 3. food for plant cells
- 5. changing of a gas into a liquid
- 8. system/breaks food down into the chemical nutrients that body cells need for energy, growth, and repair
- 9. jellylike material that contains chemicals that help keep a cell healthy
- 13. membrane/a covering that protects every cell