Some Protists are autotrophs, containing chloroplasts and make food energy through photosynthesis, while other protists do not contain chloroplasts, and are heterotrophs by gaining food energy through phagocytosis.
Amoeba
An Amoeba is a single-celled animal that catches food and moves about by extending fingerlike projections of protoplasm. Amoebas are either free-living in damp environments or parasitic.
Paramecium
A Paramecium is a single-celled freshwater animal that has a characteristic slipperlike shape and is covered with cilia.
Euglena
A Euglena is a green, single-celled, freshwater organism with a flagellum, sometimes forming a green scum on stagnant water.
Respiration
Protists use aerobic respiration. Aerobic respiration enables the organisms to be able to get more usable energy form their food without wasting any oxygen.
Reproduction
Protists can reproduce sexually and asexually. Amoeba reproduce asexually through process called binary fission. They create another nucleus, and then split in two. The second amoeba is identical to the original. Paramecium and Euglena can reproduce sexually or through by binary fission.