What cell parts appeared common to all the specimens observed under HPO paramecium squamous cell onion root cell?

Under high power objective (HPO) microscopy, both Paramecium and onion root cells exhibit common cellular structures such as the cell membrane, cytoplasm, and nucleus. The cell membrane serves as a protective barrier, while the cytoplasm contains various organelles essential for cellular processes. In both specimens, the nucleus acts as the control center, housing genetic material. Although Paramecium is a single-celled organism and onion root cells are part of a multicellular plant, these fundamental components remain consistent across both types of cells.