Answer:
I believe it;s the difference in pressure
Explanation:
This is caused by the diaphragm contracting and therefore expanding the thoracic cavity. This increase in volume causes a decrease in pressure.
Answer:
below
Explanation:
I have no idea... I need to study this
Answer: Only Dental Hygienists remove extrinsic stains, accretions, and calcareous deposits from teeth.
Explanation: