A vaccine is a medical material that mimics the pathogen, but in a harmless way. When our body's immune fights it off, it remembers how to fight the real pathogen when it enters our body. So, it protects us from diseases.

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An ecologist studied the effect of biotic and abiotic factors on a population of bacteria at the bottom of a pond. His study wou

andrew11 [14]

c) Organs your welcome

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Select all of the ways Henrietta Lacks (Hela cells)￼￼ have changed medical science from the list below:￼

Select all of the ways Henrietta Lacks (Hela cells) have changed medical science from the list below: