Biology

4. Study of relationship amongst organisms and the enviroment.
5. Bodies consist of repeated segments.
8. Population growth that stabilize indefinitely at the habitat' carrying capacity.
9. The three groups of primates are prosimians, monkeys, and ___.
13. Segmented animals with jointed appendages and a chitin-rich exoskeleton.
14. Improves flexibility and increases the potential for specialized body parts.
15. Unique stage in embryonic development of animals.
16. Sessile form of cnidarin.
17. Factors that limit population regardless of size.
18. Unsegmented worms that molt periodically.
19. Population growth that is proportional to the size of the population.
21. Aquatic, sessile animals that are either asymmetrical or radially symmetrical.

1. Immediate ancestor of animals.
2. Most diverse arthropods
3. Factors that limit large population.
6. density Measure of the number of individuals per unit area of habitat.
7. Unsegmented animals that lack a coelom.
10. Spiny-skinned marine animals.
11. Free swimming form of cnidarin.
12. vascular system Enables echinoderms to move, sense their environment, acquire food, exchange gases, and get rid of metabolic wastes.
15. Helps determine the population size.
20. Gastrula's first indentation form in the mouth.