Proteins are made up of monomer units called amino acids
It represents the history of time which ends up being divided on the basis of the earth's biotic composition
The correct option is IT CAN FORM FOUR COVALENT BONDS.
Carbon is capable of forming four covalent bond in order to attain the octet form, this gives it the ability to combine with different elements in different ways. The ability to combine with different elements makes carbon to be abundant on the earth, because it is found in variety of different substances.
Answer:
<u><em>Plant cell, Bacterial cell and Animal cell</em></u>
<u><em>Example: </em></u>Plant viruses:Tobacco Mossiac Virus
Animal virus: HIV(Human immunodeficeincy virus),Rhino virus
Bacteriophage
Explanation:
Viruses attack living cells on the basis of their host types.
