Before Pasteur's experiments with beef broth and S-shaped tubing, what did people think about cells?
O A. Cells could generate spontaneously.
O B. Cells differentiate from stem cells.
O C. Cells came from preexisting cells.
O D. Cells do not contain a nucleus.

A. Cells could generate spontaneously

Explanation:

The theory of spontaneous generations is a hypothetical theory, which states that living organism originate from the non-living matter

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.