There are different kinds of muscles in the human body. Each muscle is formed from a group of cells that works together. The main function of a group of muscle cells is to...

The earthworm is adapted for living underground. Eight bristles protrude from all but the first and last segments of the body of the earthworm.

Which behavior is most likely helped by the bristles?

When coral animals in the ocean reproduce, they release thousands of eggs and sperm into the water. Which method would help ensure that reproduction is successful?