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The sun is an example of an external energy cycle

Skiing

The primary function of vitamin D is to regulate the metabolism of the minerals

Women who take oral contraceptives are at risk for deficiency of 

A rich source of vitamin E is

The disease associated with niacin deficiency is

Male sex as compared to female sex

Symptoms of a user with technology addiction include all of the following except __________.

Users may have ______________________________ if they have sore, tired, burning, itching, or dry eyes; blurred or double vision after prolonged staring at a display device; headache or sore neck.  

PDF stands for _________________________________.