| __ | 1. | Acid Rain | | A. | rain carrying pollutants (dirt) from factories |
| __ | 2. | Adaptation | | B. | new traits that help organisms survive (giraffe's neck) |
| __ | 3. | Air Pollution | | C. | Organisms that existed way before |
| __ | 4. | Amoeba | | D. | A situation where oxygen is NOT being used |
| __ | 5. | Anaerobic | | E. | Carbon Dioxide enters the air and makes it unsafe |
| __ | 6. | Ancestor | | F. | An organism composed of 1 single cell |
| __ | 7. | Anomaly | | G. | Organism that creates its own food (sugars) |
| __ | 8. | Asexual Reproduction | | H. | Layers of gases above the ground surround Earth |
| __ | 9. | Atmosphere | | I. | Something odd, weird, strange |
| __ | 10. | Autotroph | | J. | method of cloning, one cell self-duplicates |