The purpose of this is to indicate the changes or effects in pulse rate bought by exercise.
We can also call this the control set up, it is where all the setting is same except without the variable that is going to be tested. So in this case, that variable is exercise.
So it is supposed that both set up has same settings such as the amount of time measuring the pulse, or the position of arm or neck etc.
Answer:
d. have more than seven neutrons.
Heating and cooling our homes, lighting office buildings, driving cars and moving freight
It would be primary since the writer himself is getting the information from a direct source.
