All organisms in the kingdom must be viewed using a microscope

Archaebacteria

Explanation:

All organisms in the archaeobacterial kingdom can be viewed with the aid of a microscope, which is able to enlarge images hundreds or thousands of times. However, without the microscope it is possible to see the colonies, structures formed by thousands of them.

Most members of this realm are chemosynthetic autotrophic while bacteria. This feature allows them to live in extreme places where many other organisms would not survive. Usually these organisms have characteristics that not only allow them to survive in these environments, but also seem to improve in extreme environments.

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voluntary muscles are controlled by the cerebellum.