One difference between these cells is plant cell has chloroplast but animal cell does not have chloroplast.
Another difference between these is that plant cell has cell wall but animal cell does not have cell wall.
Explanation:
Plant cell are known to cells that possess chloroplast. These chloroplast contain chlorophyll which enables the plants to manufacture their own food. Animal cell does not possess chloroplast which makes it impossible for animals to manufacture their own food.
Plant cell actually have cell wall and a cell membrane but animal cell does not have cell wall but only possesses cell membrane. The cell wall gives mechanical strength and maintains cell shape.
Hydrogen and oxygen are often found in the form of H2O but even if hydrogen surpasses oxygène in number it doesn't when it comes to mass because M(O) = approximately x16 M(H)
I'm pretty sure the answer is b because since multicellualr organisms have more cells, they carry out more functions rather than a singlecellular organism.