How deep is the lumbar facet joint from the skin surface?

Is a short-term risk associated with tobacco use. a. lung cancer b. heart disease c. stroke d. coughing

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

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