Difference between brain and spinal cord
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They are both part of the nervous system but the brain is housed inside the skull and it controls most of the activities of the body. In higher organisms such as humans and other vertebrates, it is the centre of learning. Then the spinal cord is a tube-like structure that begins from the end of the brain and ends at the bottom of the backbone. The spinal cord is made up of nerves that carry information between the brain and the rest of the body.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged