If you ever have swelling in your extremities, the way that fluid gets back out into the blood stream is by the circulatory system. a. true b. false

What do animals wth echolocation have in common other than echolocation

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.