These diagrams demonstrate how cells can be differentiated by their
oa.
means of replication.
ob.
cell structures.
c. sizes and densities.
od. modes of locomotion.

Hello. You forgot to place the diagram. The diagram is added just below.

B. cell structures.

Explanation:

Cells are their functional and structural units. Basically the cells are formed by a cell membrane (delimiting the cell and providing protection), a cytoplasm (where the organelles are) and a nucleus (responsible for reproduction). However, some characteristics allow the cells to be classified into two prokaryotic and eukaryotic groups. Although similar, these cells have different structures that help to differentiate them quickly. Among eukaryotic cells there are animal and plant cells, which also have different structures that help to differentiate them, as you can see in the diagram.

a covalent bond, specfically triple bond