In the early twentieth century, what was Alexander Fleming’s hypothesis concerning the relationship between a yellow-green mold and certain strains of bacteria?He thought the bacteria had released a

In the early twentieth century, what was Alexander Fleming’s hypothesis concerning the relationship between a yellow-green mold and certain strains of bacteria?

He thought the bacteria had released a chemical that caused the mold to grow.

He thought the mold had released a chemical that prevented the bacteria’s growth.

He thought the bacteria fed on the mold, causing it to shrink and disappear.