The are thin-walled blood vessels that exchange materials through their walls.

a. arteries
b. arterioles
c. capilleries
d. venules

Astudy was performed on 20 trees to test the effectiveness of a new fertilizer. the results of this specific study is brought into question. what would possibly improve the reliability of the results?

What are two reasons for why a species might disappear from the fossil record?

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously