name two medical technologies that have helped combat the spread of disease in cities. Explain how each technology has helped

Masks and Vaccines (RNA vaccines but normal vaccines help as well)

Explanation:

Masks: As we can tell cities that have a mask mandate have lower corona numbers

Vaccines: Vaccines give your body the antibodies that it needs to protect your body from infection without the virus. RNA vaccines are better than the normal vaccines because they are going to be produced faster than normal vaccines

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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explanation: