a)The brain is protected by the bones of the skull and by a covering of three thin membranes called meninges.
b) Even before you leave the womb, your brain works throughout your life to control your body's functions and helps you understand and interact with the world around you.
The role that the mosquito played is that the mosquito was carrying the organism/infection so once it bit Jane, Jane got infected. (Not sure is that’s what your asking but that’s the best I can explain it.)
