What line of evidence made scientists realize that Wegener was right about continental drift?
a. Apparent polar wander
b. The puzzle-like fit of the continents
c. The distribution of exact fossils on widely separated continents
d. The change in polarity of the magnetic field from normal to reverse

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explanation: bc blah

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.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.