Alveoli small balloon-like structures which are responsible for the oxygen exchange in the lungs across the membranes. These are attached to the branches of the bronchial passages. These alveoli inflate and deflate with inhalation and exhalation. Answer is C.
Gravity and Inertia is the answer
Answer:
see below
Explanation:
Do you mean beats per minute (BPM)? To find that, take your index & middle fingers and place them together on your neck or wrist where you feel your heartbeat. Take a timer or stopwatch and count how many beats you feel in 15 seconds. Multiply this number by 4 to get your BPM (alternatively, you could also count for 30 seconds and multiply by two, or for the full minute, but 15 seconds is a lot faster and easier). If you need a resting BPM, either take it when you wake up in the morning (most accurate), or rest for a while.
I hope this helps!
It is definitely B , good luck:)
