Compare and contrast the polyp and medusa stages of a typical jellyfish.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes