When heat flows into a system its value is _ when heat flows out of a system its value is negative

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? ?

c. 4.54 x 10–12 j happens to be correct