These single cell organisms occupy almost every microhabitat. Even though these organisms are single celled, they can still have motility, food vacuoles, and contractile vacuoles. The food vacuoles are used to enclose food particles for digestion while the contractile vacuoles are used to expel excess water. Phylum Rhizopoda Amoeba's lack cell walls. They are identified by their pseudopodia.
Pseudopodia are false feet which use the same contractile proteins that are in muscles.
The pseudopodia are also used for locomotion and gathering food. Amoebas lack flagella, and they reproduce asexually. Some amoebas are parasitic. A common disease caused by amoebas is amoebic dysentery. It causes diarrhea.