The smallest unit that retains the properties of an element is a(n) atom molecule proton compound neutron

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explanation:

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.

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plasma - state of matter made up of electrically charged particles