A(n) is a pure substance that can't be broken down into simpler substaces by chemical or phyical means. a. chemical b. mineral c. element d. atom

A(n) element is a pure substance that can't be broken down into simpler substances by chemical or physical means. 

For example, if we were to speak about the 'chemical element' based on  which would  be oxygen, we can see and understand that this kind of substance can not be broken down into smaller pieces because this is an element, and nothing can stop this from getting smaller, and also shrinking in size and also having it be destroyed.

But that would just be an example, but therefore, your correct answer would be "element".

May consider a group  g=({0,1},+)g=({0,1},+)where  ++  will work as the xor operator like we work in boolean algebra. note here, that ‘00’ and ‘11’ are not the usual 0 and 1 that we work with everyday. the elements are  called  ‘00’ and ‘11’ and  may not mean  zero (nothing) and one (single). ‘00’ is the identity for the given binary operator +, meaning that any element operated with ‘00’ gets us that element itself.  for a set  ss  in  g′g′  having more elements than just  {0,1}{0,1}  the values for  a+b∈sa+b∈s, such that  a∈s,b∈sa∈s,b∈s, have to be first defined, only then can you determine the value of  1+11+1. the answer could possibly have been  22  if oanswer is25,000