What do carbon, oxygen, hydrogen, and nitrogen have in common

they all have the same number of valence electrons. they all have umpaired electrons in their valence shells. They are elements produced only in living cells.
Each element exists in only one isotopic form.

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.