Which of the following is the best description of an elment A. A substance that cannot be broken down into simpler substance
B. A small particle made with a specific chemical composition
C. A naturally occurring mineral made of more than one substances
D. A collection of atoms that have different abilities when joined together

An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.

Explanation:

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.