Across
- 1. marks the end of succession
- 2. prokaryotes do not have this
- 8. part of the atom that forms bonds
- 9. cells need this kind of surface area to volume ratio
- 10. both organisms are negatively affected
- 12. process that stores energy
- 13. growth represented by the human population
- 15. energy in motion
- 17. transport against the concentration gradient
- 18. group of cells working together
- 19. the plasma membrane is made of a phospholipid ____
Down
- 1. lighting a match
- 3. all the ducks living in a pond
- 4. characteristic of life associated with energy
- 5. limiting the size of families to protect the earth
- 6. has frequent droughts and fires
- 7. food source for lipids
- 11. form of nitrogen that plants can use
- 14. contributed to cell theory
- 16. group that is not exposed to the independent variable