Lack of sunlight will directly affect the formation of

Vitamin D3

Explanation:

Bone resorption is a process whereby bone matrix is destroyed by substances released by osteoclasts.

Bone resorption may occur when blood calcium levels are low.

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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.