Across
- 1. animals
- 4. bottom of the wave
- 7. a chemical reaction that releases energy by light or heat.
- 8. a compound or substance that has been purified or prepared, especially artificially.
- 13. essential to living organisms
- 16. a group of atoms bonded together
- 17. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
- 18. freezing
- 23. a process in living organisms involving the production of energy
- 25. hot
- 26. top of a wave
- 27. Fall
- 28. the branch of biology that deals with the relations of organisms
Down
- 2. the substance of which a physical object is composed
- 3. the bones of a animal
- 5. a fart
- 6. hard
- 9. get from eating food
- 10. like water
- 11. tool to find how hot something is
- 12. a group of atoms bonded together
- 14. reactions in which the reactants absorb heat energy from the surroundings to form products
- 15. after a test you get a
- 19. an organism, especially a soil bacterium, fungus
- 20. A basic part of a whole
- 21. source of nuclear energy.
- 22. science concerned with Earth
- 24. is a chemical element with the symbol C and atomic number 6