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Answer:
STD stands for sexually transmitted disease, whereas STI means sexually transmitted infection. Essentially, the difference is between a disease and an infection. Not all diseases begin with infections, but many do. Sexually transmitted disease first begin as sexually transmitted infections.
Explanation:
The nervous system has two main parts:
~The central nervous system is made up of the brain and spinal cord.
~The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
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