The answer is litter carbon dioxide bubbles
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They can all make you ill and be dangerous for the body
All the nerve processes radiating out beyond the brain and spinal cord, as well as all the neurons outside the brain and spinal cord, constitute the peripheral nervous system.
Spinal cord is the backbone present in the vertebrates. It is essential for the correct posture and erect body. It extends from the end of the brain till the hipbone. The spinal cord consists of total 5 types of bones called vertebrae, that are total 33 in number.
Peripheral nervous system consists of parts of nervous system outside the brain and the spinal cord. It involves cranial and spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions.
To know more about peripheral nervous system, here
brainly.com/question/328696
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Electron shell is the outer orbital, while the inner orbital are just called orbitals.
