4. Gene Pool is not a mechanism, thus your answer!
Answer:
Autorhythmicity of the heart
Explanation:
It is the study of the characteristics features of the cardiac muscle cells with the ability to initiate action potential at certain level without connection to any external stimulus which the heart beats constantly and rhythmically. Cardiac muscle cells controls the rate of contraction of heartbeats.
Yes your equation is correct as formula for butane is c4h10 and equation is balanced
I believe the answer is the location of energy sources