Exocrine glands do not
a release their products into ducts
b. empty into a surface or cavity
c. stimulate receptors in target cells
d. all of the above are characteristics of exocrine glands

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

Which description provides the best objective summary of the article in the passage?

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures