Carbohydrates are made up of carbon, hydroyen, and? a. oxygen b. helium c. copper d. potassium?

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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? ?