Microscopic image of stained sample of unknown amoeba. Amoeba are unicellular organisms which can change their shape.
The Other 95%, Wikimedia Commons
Amoeba proteus showing pseudopodia (finger-like extensions). All amoeba are eukaryotic (contain a nucleus) and show presence of pseudopodia. Some amoeba may cause disease in humans.
SmallRex, Wikimedia Commons