Answer:
B
Explanation:
negative feedback is used to regulate feedback
<span>Sputum membranes tests are used to test the lungs, trachea and bronchial canals for pathogens that can have an adverse affect on the lungs. These pathogens can cause infections that can have serious effects on your breathing and all over health.</span>
Please dont cheat your way through medical school
Answer:
all of the above i believe..
Explanation: