The mechanical advantage of the wheel and axle if found by dividing the radius of the wheel by the radius of the axle Which type of wheel and axle has the greatest mechanical advantage?

then that particular organisms become extinct.

the answer is d (apex) good luck : ))

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.