Final answer:
The odd one out is Bacteria because it is a prokaryote, while the others, Amoeba, Paramecium, and cheek cells, are eukaryotes. Bacteria have simpler cell structures without a nucleus, differentiating them from the complex, membrane-bound organelles in eukaryotic cells.
Step-by-step explanation:
When asked to circle the odd one out among Bacteria, Amoeba, Paramecium, and a cheek cell, the odd one out is Bacteria. The reason for this is that Bacteria are prokaryotes, which means they have a cell structure that lacks a nucleus and other membrane-bound organelles. In contrast, Amoeba, Paramecium, and cheek cells are all eukaryotes, which have a more complex cellular structure including a nucleus and organelles enclosed by membranes. Amoeba and Paramecium are both single-celled protists that have distinct methods of locomotion and feeding, with Amoeba using pseudopodia (false feet) and Paramecium using cilia. A cheek cell, formally known as a squamous epithelial cell, is a type of cell that makes up the lining of the mouth in humans and many animals, distinguished by its flattened shape and symmetrical nucleus.