| A | B |
| Nourishment | value of food that animal need |
| Equilibrium | situation of balance |
| Artic | large cold area around pole |
| Vertebrate | animal with spinal column |
| Invertebrate | animal without spinal column |
| Pupa | insect between adult and larva |
| Evidence | something that gives proof |
| Adventitious | developing in an unusual postion |
| Aerobic | living only in oxygen |
| Altruism | attitude of unselfish concern |
| Amoeboid | resembling amoeba movement |
| Analogous | same function, different origin |
| Anaerobic | living without oxygen |
| Annual | plant only lives 1 season |
| Anthropoid | belonging to apes |
| Arboreal | tree-dwelling |
| Autonomic | action without conscious control |
| Axillary | growing between leaf and stem |
| Behavior | response to certain conditions |
| Bilateral Symmetry | right and left halves looking identical |