30 points

rhizobium is a bacteria that invades the root nodules of certain plants. these bacteria obtain nutrients from the plant cells and also fix atmospheric nitrogen so it can be used by the plants. which statement describes the relationship between the two organisms?

a. the bacteria don’t harm the plants but benefit only themselves.
b. the plants harm the bacteria but benefit themselves.
c. the relationship benefits both the plants and the bacteria.
d. the association harms both the bacteria and the plants.

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?

Did you know that a blue wales tongue weighs more than an elephant?

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success