Compare to a skin cell a muscle cell is likely to have more what?
a. gogi bodies
b. mitochondria
c. cell membranes
d. chloroplasts

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