HELP ME PWhat are the reactants in a chemical reaction? O A. The ending substances
B. New substances that are formed
O c. All substances that are involved
O D. The starting substances

D. the starting subtances

:)

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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? ?