How did Louis Pasteur’s experiments lead to new scientific understandings of germs?

B. Experiments with different magnification lenses showed that germs were real and could be observed.

Explanation:

I did it on edgenuity!

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the answer is A because everyone is saying that in the comments on the other answers

Nondisjunction.

Explanation:

Down Syndrome is a condition caused by trisomy 21, in which the person has 47 chromosomes instead of 46. The error in cell division called nondisjunction    (causes trisomy 21).

Nondisjunction Is the failure of paired chromosomes to divide during cell division, so in this division both chromosome go to one daughter cell. This cause errors in chromosomes number such as Down Syndrome (Trisomy 21) and turner syndrome (Monosomy X).