(i) The first example highlights the factors the essay is asking you to explore: social and environmental determinants.
(ii) The second example highlights the directive verbs "identify" and "explain". Identify means to determine the key points to be addressed and their implications. Explain means to make plain, interpret, and account for in detail.
(iii) The third example highlights the main topic of the essay question: Cardiovascular diseases among adult Aboriginal People in Australia.