A) heterotrophic bacteria present in aquatic and marine environments. B) mixotrophic algae and amebas present in aquatic environments. C) photosynthetic algae and bacteria present in aquatic and marine environments. D) heterotrophic algae, bacteria, and protists present in aquatic, marine, and terrestrial environments. E) photosynthetic algae and plants present in aquatic, marine, and terrestrial environments.