Give an example of a type of unicellar organism

Unicellular organisms are living organisms that exist as single cells. Examples include bacteria, such as, Salmonella and protozoa like Entamoeba coli. Additional example: Phytoplankton.

Hope this helped!!!  :)

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek

the answer u all are looking for is 4000000000000000000000 million years.