A substance that cannot be broken down into the other substa
     A substance that cannot be broken down into the other substances by ordinary chemical procedures is a(n) _______  compound  isotope  element  proton  molecule  Which of the following is a trace element required by most living organisms?  hydrogen  carbon  oxygen  magnesium  nitrogen 
  
  Solution
Q. A substance that can not be broken down into other substances by ordinary chemical procedures is an
Answer:- Element.
Q. Which of the following is a trace element required by most living organisms?
Answer- Magnesium
 By weight, magnesium accounts for only 0.1% of most living things.

