Host cells of viruses include
1) humans and other animals.
2) plants and fungi.
3) bacteria.
4) protozoa and algae.
5) All of the choices are correct.

All of the choices are correct.

Explanation:

Viruses are non cellular entities which are made up of either a DNA or RNA enclosed within a protein coat.

Viruses cannot reproduce by themselves. They can reproduce only within living cells and hence they are obligate intracellular parasites.

Viruses have a wide range of hosts including animals, plants, bacteria  etc.

However, each viral species has a very limited host range.

the correct answer is - ability to find a mate

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.