Amoeba is an organism which has catches or engulfed the food by its pseudofeet(false feet).this has no has pseudopodia which helps in absorbing something.amoeba's don't harm but only some of them are parasites.and there is also a type of amoeba called brain eating amoeba which harms.but mostly amoeba's doesn't harm. Hope this helps u.
Amoeba is the a type of a cell or organism which has ability to alter its shape, primarily by extending and retracting pseudopods. Amoeba do not form a single taxonomic group, but are found in every major lineage of eukaryotic organism. Amoeba not only occur in protozoa but only in fungi, algae, and animals. Amoeba is a single cell. Amoeba can harmful- Example when a person want to go to swim in the pool in warm fresh water during summer, in water contaminated with moving  amoeba can be found up the noise and in the brain.

This cause headache, stiff neck, vomiting, which can serious symptom. Generally results in a coma or death after five days.