Question

louis pasteur determined that microbes only appeared in a 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:

Pasteur's experiment showed that microbes in the air contaminated the broth, supporting the idea that cells come from pre - existing cells. His work refuted spontaneous generation and reinforced the cell theory principle that all cells arise from pre - existing cells.

Answer:

All cells come from preexisting cells