Question

louis pasteur determined that microbes only appeared in sterile broth if the broth was exposed to the air. he concluded that the microbes were found in the air and contaminated the broth. pasteurs findings contributed to which part of the cell theory?

all animals are made of cells.

all cells come from pre - existing cells.

the cell is the basic functional unit in living things.

unicellular organisms inherit an exact copy of dna from the parent cell.

Explanation:

Louis Pasteur's experiment showed that microbes didn't spontaneously generate but came from pre - existing microbes in the air. This supports the cell theory principle that all cells come from pre - existing cells.

Answer:

All cells come from preexisting cells.