of single-celled eukaryote acritarcha, protozoa of single-celled eukaryote euglenozoa, prot

abstract acrita acritarcha ancient animal art background biology black cell celled colorful dark debris design drawing earth euglenozoa eukaryote eukaryotic facility graphic health heterotrothy illustration isolated life live medicine membrane micro microbiology microorganisms microscope nature nucleus organic organism origin parasite prot protista protozoa protozoan protozoavector science sick single singlecelled symbiotic tissue vector water