The nervous system is divided into the central nervous system and the peripheral nervous system. The central nervous system consist of the brain and the spinal cord while the peripheral nervous system consists the nerves which connect the CNS to other parts of the body. Autonomic nervous system is part of the PNS that supplies the effectors (muscles and the glands)n which influence the function of internal organs. Its is the sympathetic part of the ANS that triggers many of the physical responses we have when we experience an emotion.
C, it's mainly how their genetical system works given from their Biological parents.
I would like to help but I know what language this is sorry
Out of Africa theory
This theory is supported by modern research that early primate life begun in Africa and later spread to other parts of the world. several prehistoric sites have been unearthed in the East African region which supports these assertions.