The amount of fuel used to heat and cool your home can be reduced by good

The amount of fuel used to heat and cool your home can be reduced by good insulation.

answer; i believe the correct answer is ( proteins );

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.