Which of these parts of the cell membrane are polar and allow the cell to
exist in water?
o
a. phosphate groups
o
b. amino acid chains
o
c. fatty acid chains
d. globular proteins
o

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.