The organism that is most likely 100 micrometers in size is a bacterium. The correct option is D.
Bacteria is a microorganism that is present in every atmosphere and condition. They can survive extreme conditions of the earth. They are small and can not be seen by eyes, without microscopes. There are good and bad bacteria.
There are different sizes and shapes of bacteria. They can be rod-shaped, spherical, or irregular-shaped. Their size is from 1 micrometer to 100 and many more micrometers.
Micrometers are a measurement quantity, which measures the size of a very small particle or organism, that is only seen under microscopes. Viruses and bacteria and other protists and algae come under this measurement entity.
Thus, the correct option is D. bacteria.
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