Bacteria on legumes are able to fix nitrogen from the air.
True or false?

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

The fluid mosaic model of the membrane proposed that membranes

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.