Answer :
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1. The three indicators that make up the Human Development Index (HDI) are:
a) Life expectancy at birth
b) Mean years of schooling
c) Gross National Income (GNI) per capita
2.
a) GDP is the total value of all the goods and services produced in a country.
b) GDP per capita is the GDP divided by the total population in a country.
3. Economic indicators alone do not provide enough information about the levels of development in a country because they do not consider factors like access to education, healthcare, income distribution, and overall quality of life. For a comprehensive understanding of development, social and environmental indicators should also be taken into account.
4. The level of air pollution in a city is an environmental indicator.
5. The number of doctors compared to a country's total population can indicate the quality of healthcare services, access to medical facilities, and overall health standards in a country. Higher numbers of doctors per population generally suggest better healthcare infrastructure and services, which can be an indicator of development in a country.
I hope this breakdown helps you understand the concepts better. Feel free to ask if you have any more questions!