(a)[2]
Describe the method the students could use to measure their breathing rates.
(b)[2]
Write a hypothesis for their investigation.
(c)[6]
Describe and explain the results shown in Fig. 2.2. Support your answer with data from Fig. 2.2.
(d(i))[1]
State why.
(d(ii))[3]
Explain why exercise is advised for people who are at high risk of developing coronary heart disease.