Plasma continually leaks from the capillaries into interstitial fluid. in spite of this loss, blood plasma levels are maintained by the

a. return of fluid by the lymph vessels to the bloodstream.
b. regular intake of liquids to replace lost fluids.
c. drawing back of plasma into lymphatic vessels by the pumping action of the heart.
d. active transport of water against the concentration gradient.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

The transport tubes for food coming down the plants are called?

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.