Can someone explain why its great to work with 12 year olds and younger kids?

In your own words write a brief paragraph about the importance of warning signs.

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.

Who to determine crops that are best suited for a given piece of land?