Which class of molecules contains the amino group, nh2

Proteins

Explanation:

Proteins are one of the biomacromolecules. Proteins are polymers of amino acids. Each amino acid has a central carbon atom to which an amino group, a carboxyl group, a hydrogen atom, and one side chain are bonded. Many amino acids are joined together by peptide bonds to make long chains of proteins.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

b) the inside picture would look at a very high temperature in a very low ph