Across
- 2. a whole formed by a connection of two or more elements
- 4. plants give humans this
- 6. cells are made of this
- 7. a source of light and heat
- 8. contains chlorophyll and other pigments
- 9. things in our surroundings
- 11. produced by reactions involving atomic or molecular changes
- 13. the simplest structural unit of an element
- 14. organic compounds
Down
- 1. large organic molecules
- 3. the process that happens to a plant
- 5. makes the plant green
- 10. a sweet crystalline substance obtained from various plants
- 12. any substance that cannot be broken down into simpler