The majority of exchange of gases and nutrients between blood and tissue takes place at the level A. capillary bed B. small elastic artery C. venule D. small muscular arteriole

Explain why phospholipid molecules form a bilayer. (3 marks)

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Types of scientific inquiry that biologist engage in that cannot be completely controlled