Across
- 9. a collection of tissues
- 11. puffy clouds
- 13. bottom layer of the atmosphere
- 15. coldest layer of the atmosphere
- 17. Evaporation of water from a plant
- 20. cell division of body cells
- 21. water vapor in the air
Down
- 1. made of one cell
- 2. body system that gets rid of carbondioxide
- 3. where DNA is stored
- 4. storage of a cell
- 5. gases that surround the earth
- 6. outer layer of the thermosphere
- 7. clouds that are high in the sky
- 8. photosynthesis in plant cells
- 10. segment of DNA that is for a specifictrait
- 12. clouds that cover most of the sky
- 14. something that is living
- 16. used to sense sunlight
- 18. clouds in the middle of the sky
- 19. type of cloud that means rain