In an experiment on eye development, a thin piece of aluminum foil was placed between the bulging wall of the brain and the overlying ectoderm where the eye normally forms. Wherever the foil was placed, the lens failed to develop because the foil __________.
changed the gravity in the region
rearranged the cytoplasmic determinants in the adjacent cells
prevented the cortical reaction
prevented the acrosomal reaction
prevented the inductive contact that normally stimulates the lens to form