A student studied the factors that affected the rate of decomposition of vegetables by bacteria in the soil. The student placed carrots into three different plastic bags. He added a different brand of potting
soil to each of the three bags. He added the same amount of water to each bag and kept all of the bags
at room temperature. After four days, the student removed the carrots from the bag and weighed them.

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explanation:

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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.

c. heat from the poles back down towards the equator.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.