The paramecium is considered an animal even though it is single-celled. To stay alive, it has a tube and thread used for locomotion.
Eukaryotic cells contain several types of organelles, while prokaryotic cells contain a few organelles and none of them are bound by a membrane.
The animal cell is unique because it has the self-destruct system. When the infected and broken cells cannot be fixed, they get completely destroyed through the self-destruct system. It is called apoptosis.
The nucleus can be located anywhere inside the cell.