Whats located inside the nucleus and important in cell reproduction?

To avoid whiplash, the center of the headrest must be your ears.

How will your health most likely be affected if you follow the recommended guidelines for sleep, rest, and physical activty

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.