They have many organs including a gullet, or mouth, food vacuoles, and an ectopract. They also have a contractile vacuole that balances water like a kidney. Their micronuclei is used for reproduction, and the macronuclei is used for protein synthesis. Amoebas have pseudopodia, or false feet. Proteins, like those found in a human's muscle, contract and relax their pseudopodia enabling them to move.
Most amoebas are harmless.
However, not all of them are. Some cause illnesses like amoebic dysentary. Amoebas eat by a process called phagocytosis. Their name means bearer of windows. The psuedopodia come out through the windows.