The cerebrum controls the higher brain functions such as speech, writing, etc. The cerebellum deals with the involuntary stuff. The other 2 are nowhere near what you are looking for. B - Cerebrum is your answer.
As when things get eaten some of the energy is lost the predators have to have more than one prey to survive, this means there is only a limited amount to be shared which means less predators
The body would start to shut down, reactions would become weaker and slower, you would begin to get tireder and you's slowly be dying. If no fod is onsued within 2-3 weeks, then the brain will have no nutrients and will die
The diffusion would be affected because it would take longer for the solute concentration on both sides to be equal
