How did francesco redi disprove the idea of spontaneous generation?
a. he showed that flies did not grow from meat that was not exposed to air.
b. he showed that flies did not grow from meat that was exposed to air.
c. he showed that flies did not grow from meat that was not exposed to water.
d. he showed that flies did not grow from meat that was exposed to water.

A. He showed that flies did not grow from meat that was not exposed to air.

Explanation:

Francesco Redi disproved the theory of spontaneous generation which states that life can arise from the nonliving matter directly. He showed that if the meat was not exposed to air, flies did not develop on it. He concluded that the maggots in rotting meat developed from the eggs that were laid by flies and the life can arise from preexisting living beings only.