Answer :
Microorganisms so tiny they couldn't be seen under a microscope were found by Dmitri Ivanovski. These creatures are known as viruses.
A piece of nucleic acid that has been protein-coated is what makes a virus an infectious microbe. A virus cannot reproduce on its own; instead, it must infect cells in order to use the components of the host cell to create copies of itself.
A virus's main objective is to transfer its genome to the host cell so that it can be expressed by the host cell. A fully developed infectious virus is known as a virion.
However, viruses and cell-based life have several striking similarities. For instance, they have nucleic acid genomes and share your cells' genetic code. Like cell-based life, viruses can evolve and have a range of genetic variants. Viruses, therefore, seem to be in a "questionable" area even if they do not fit the criteria of life.
To learn more about viruses, refer:-
https://brainly.com/question/29312545
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