crossing over is a process where chromosomes can trade parts. this allows for a great deal of genetic variation. when does this process occur?

In what part of the body does the most muscle activity happen?

2points what do bacteria have in common with the cells of other living organisms?

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.