$\begin{array}{1 1} \text{a. Working out the efficiency of RBCs about their capacity to carry oxygen} \\ \text{b. Estimating the amount of organic matter in sewage water} \\ \text{c. Working out the efficiency of oil driven automobile engines} \\ \text{d. Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale} \end{array} $
