What is the key to proper nutrition?

Eat a variety of foods, even in very small amounts.

Explanation:

Our dietitians recommend eating a variety of colorful fruits and vegetables, whole grains, legumes, lean meats, fish, eggs, nuts, and seeds. A balanced meal contains a protein source, a grain or starchy vegetable, fresh vegetables, and healthy fat.

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the correct answer is c   with the systems

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).