Would you rather die by nuclear war or alien invasion?

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.

Prone a. front b. back c. facing up d. facing down anterior a. front b. back c. facing up d. facing down

Over-encouraging lesser skilled players can lead to embarrassment. select the best answer from the choices provided. t f