Which of the following is true about vitamin D3 (cholecalciferol)? A. It is a sterol. B. It is a hormone precursor. C. Humans enzymatically synthesize their own Vitamin D3. D. It is converted into a biologically active form by UV light from sunlight.

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Q: composed of two or more subunits, quaternary structure,

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Eating behaviors

The term "eating behaviors" is an umbrella term that encompasses aspects such as food selection and motivations, feeding habits, dieting, and eating behavior-related concerns such as obesity and eating disorders. Eating behavior is influenced by various psychological, sociological, cultural, environmental, and economic elements.