The similarity of one organism to another (for example a bacteria versus a human) is most easily done by comparing which biopolymer?
a) nucleic acids
b) polysaccharides
c) proteins lipids
d) all of these

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: