The diagrams below show the bones in the
forelimbs of three different organisms. Differences in the bone arrangements support
the hypothesis that these organisms
(1) are members of the same species
(2) may have descended from the same ancestor
(3) have adaptations to survive in different
environments
(4) all contain the same genetic information

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project