Why are these organisms not classified as bacteria?

Unlike bacteria, the organisms shown are eukaryotic cells and contain a nucleus, mitochondria, and membrane bound organelles.

Full Question:

Why are amoeba, paramecium, and euglena not classified as bacteria?

Answer:

They are eukaryotic cells.

Explanation:

The bacteria is classified under the kingdom Monera of the 5 kingdom classification where the prokaryotic organisms like bacteria and blue green algae lives. These cells lack mitochondria or any membrane bound organelles inside their cells, lack nucleus, 80s ribosomes and golgi bodies etc. They have diferent cellular structure than the eukaryotic ones.

Whereas the amoeba, paramecium, and euglena, although unicellular are under the kingdom Protista where eukaryotic organisms live. They contains well defined nucleus, membrane bound organelles, mitochondria etc. Amoeba are protozoa, and euglena is autotroph in nature.

So they aren't called as bacteria.