Question

list 2 single cell organism

Answer 1

Prokaryotes. Bacteria. Archaea. Protozoa. Unicellular algae. Unicellular fungi.

Answer 2

Earth is home to a diverse selection of living organisms that can generally be divided into two main groups. These groups are known as single-celled organisms and multicellular organisms. There are three main types of single-celled organisms -- bacteria, archea and protozoa. In addition, some fungi are also single-celled. 
Bacteria
Archaea