(a)[3]
Complete Table 1.1 by stating the percentage of each gas in the atmosphere.
(b(i))[1]
Suggest how the percentage of one gas named in Table 1.1 is altered when it is used to package food in this way.
(b(ii))[3]
Explain how this change will reduce the rate of decomposition of the food.
(b(iii))[2]
Suggest two advantages of reducing the decomposition of packaged food.