What properties greater hardness in minerals?
a. smaller atoms and stronger bonds
b. larger atoms and weaker bonds
c. larger atoms and stronger bonds
d. smaller atoms and weaker bonds

I would like to believe that the correct answer from the choices listed above is option A. Atoms that are smaller and has stronger bonds will tend to result to a greater hardness in minerals. This is because the atoms are more bound to each other.

In molecular biology and genetics, mutations are defined as changes in a genomic sequence and the DNA sequence of a cell's genome or the DNA or RNA sequence of a virus. They can also be defined as spontaneous changes in the cell. Generally, mutations are caused by radiation, viruses, transposons and mutagenic chemicals.

Transposon is a segment of DNA that is capable of inserting copies of itself into other DNA sites within the same cell.