John Needham performed a series of experiments based on Redi's experiment to support the theory of spontaneous generation. In his experiment, Needham boiled different kinds of broth in flasks, sealed them, and then let the broth cool. Microorganisms developed in the broth, providing Needham with evidence of spontaneous generation. Even though Needham's results supported the theory, what criticism did other scientists have about the experiment? A. The experiments were conducted only once.
B. Sterile flasks should have been used in the experiments.
C. The broth was contaminated before the flasks were sealed.
D. A greater variety of broth should have been tested.

18. determine whether each stateme blank space given. ach statement is true (t) or false (f). place your answer in the 8. when a cell is put into an isotonic solution, individual wat put into an isotonic solution, individual water molecules cannot move back and forth across the cell membrane. d. when a cell is put into a hypertonic solution, there is a net movement of water molecules across the cell membrane into the cell. c. when a cell is put into a hypotonic solution, there is a net movement of water molecules across the cell membrane out of the cell. d. the movement of any solvent across a semi-permeable membrane is called osmosis. e. carrier proteins have the ability to change shape and physically move molecules across the cell membrane. f. in facilitated diffusion, the concentration of the molecules to be moved across the cell membrane is higher inside the cell.