Olivia uses her elbow joint while lifting a cup. how does her elbow joint make this possible? it separates her arm bones so they move on their own. it connects her arm bones to make movement possible. it connects the biceps and triceps so they both work. it removes any ligaments that would prevent movement.

It connects her arm bones to make movement possible.

Explanation:

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.