Well, they are a major cause of HPV. There are differents groups of STIs. On one side we have the bacterial STIs, and on the other we have the viral STIs. Hope this helps.
I think that nerve tissue is brain, epithelial is skin, muscle is intestines and connective is body joints :)
A it varies from state to state
It is located in the skin blinds the outer layers of the skin to the muscles beneath
