Asingle-celled organism, found in an extreme environment, would likely be classified in what kingdom?

That would be an archaebacteria.

Archaebacteria's are single celled organisms that can be found in extreme environments such as hot springs.

Hope this helps :)

frequency or wavelenth of em radiation in a vacuum

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.