deliver oxygen to tissues and organs while picking up carbon dioxide. They empty into the systemic venules.

the answer is c.) there is a warm front in region a and a stationary front in region b.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

idk about that one.