The answer is C as isotopes are elements with same proton but different number of neutrons
Caused by many pathogens for example viruses, bacteria, parasites, toxins, and fungi
That principle is that cells are derived from other cells.
The cell in the middle differs from its surrounding cells by having a double cell membrane hence the cells do not have the exact same structure and most likely do not come from the same cell. For cells to produce food molecules, I am not too sure but I feel that the question is referring to plant cells that are able to photosynthesize. Plant cells have a cell wall and a cell membrane hence is unlikely to be represented by most of the cells in this diagram. Thus by elimination, the answer could be having the same function
