Which kingdoms contain unicellular organisms?

The kingdoms that contain unicellular organisms are Protista and Archaebacteria. Both of these kingdoms encompass organisms that are primarily single-celled.

Protista is a diverse kingdom that includes organisms like amoebas and paramecia, which are entirely unicellular. They exhibit a variety of forms and functions, demonstrating the complexity that can arise even within a single cell.

Archaebacteria, on the other hand, consists of prokaryotic organisms that are also unicellular. These microorganisms often inhabit extreme environments and have distinct biochemical and genetic characteristics that differentiate them from other forms of life, such as eubacteria.

The other kingdoms mentioned in the other answer choices either do not primarily contain unicellular organisms or are primarily composed of multicellular life forms, thus making them less relevant to the question at hand. Therefore, the correct answer highlights the kingdoms known for their unicellular representatives.