What are microorganism??

.A microorganism is a living thing that is too small to be seen with the naked eye. .

Organisms which are too small that can not be seen with naked eyes are called microorganisms.

There are 5 major groups of organisms

I) Bacteria

ii) Fungi

iii) protozoa

iv) Virus

v) Algae

They can be seen with the help of microscope

it has one origin of replication, but it proceeds in two directions - d)

gag reflex, poor dentition, gum retraction

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