What can an individual do to further public health

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.

An _ exposure is a repeated or prolonged exposure(over months or years) that may bring about slowly developing symptoms.

When comparing the digestive and urinary system, we can conclude that they both