Answer is B.
As the diaphragm contracts and flattens, it increases the volume of the thorax where the lungs are located. This results in a decrease in pressure (Boyle’s Law, if you know it) that creates a pressure gradient from outside to inside. This is what causes air to move into the lungs.
Answer:
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No, isotopes would have a different number of electrons
1.34*10^6
Move the decimal 6 times to the left, it is a number 1-10