What are two functions of the thymus gland?

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.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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