Question

What characteristics of protozoa make them resemble animals?

Answer 1

Protozoa are unicellular organisms, which found some characteristics in common with animal cells. Protozoa are single-celled organisms with animal-like behaviors, such as motility and predation. In comparison to pluricellular organisms, protozoa are closer to the animal kingdom than to plants. They are heterotrophs and have a rudimentary locomotion system. They do not have cell wall and some species present structures, which are similar to the structures of a primitive digestive system with a cytostome or mouth and cytopyge specialized in digestion and excretion process. There is strong support for the hypothesis that animal cells evolved from protozoa.