No correlation. Having a larger brain doesn’t mean you can store more knowledge.
Ask people make experiments
Your answer is going to be A
A) it is possible if they both have the recessive O type
Different structures of cells can exist within the same organism. Different structures of cells may be indicative of different organelles presents different structures mostly arise due to different functions of the cell, as how structure of cells always complement the function of cells hence it is most it is mostly likely the last option that the cells have different functions