They are aquatic and live in ponds, streams, oceans and springs. They are heterotropic and usually reproduce asexually, but sometimes by conjugation . For reproduction they produce spores, which do not require fertilization. They are all parasites, and plasmodia cause malaria in humans, other mammals and birds. They are unicellular.
Euglenoids are autotropic and heterotropic.
When light is available they use the sunlight and photosynthesize. However, when there is not sunlight they are heterotropic and eat food. They have a flagella for locomotion. They are unicellular and autotrophic. Their outer covering is made of silica, which is used as an abrasive for things like toothpaste and polish.