Why is a microscope used to observe bacteria? ?

A phase contrast microscope uses an optical technique that works by the use of a device to read the difference in thickness of the subject affecting the phasing of light resulting in a high contrast image. Staining bacteria also help microscope users to see bacterial structures that would have otherwise been invisible to the naked eye.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

d eras and periods