*Foetus=variant spelling of fetus (chiefly in British nontechnical use).
*Amoeba=a single-celled animal that catches food and moves about by extending fingerlike projections of protoplasm. Amebas are either free-living in damp environments or parasitic.
*Yeast=a microscopic fungus consisting of single oval cells that reproduce by budding, and are capable of converting sugar into alcohol and carbon dioxide.
*Singled Celled Organisms=only has one cell
*Multi Celled organisms= are organisms that consist of more than one cell, in contrast to single-celled organisms