Carbon is black, crystalline and hard. oxygen alone is a gas. how does the substance that is formed when these two elements combine differ from carbon?

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

the answer would be a

it is the most commonly accepted one