A human cell contains at least two meters of DNA that is compacted to fit into a nucleus that is about six micrometers in diameter. The proteins responsible for packaging this DNA are called , of which there are primary types.

Histones

Four (4) Primary types

Explanation:

Histones are proteins which are involve in packaging.

4 primary types which are  H1, H2 , H3, H4.

The proteins responsible for packaging this DNA are called Histones , of which there are four (4)  primary types.

1.the evidene of the reaction

2.yes

3.yes

the correct answer is:

a population changes in response to a change in the environment.