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Explosive growth in human population size can be attributed largely to:
A. Declining death rates due to improved medical care
B. Proliferation of fast-food outlets, leading to easier access to nutrients.
C. Increasing birth rates due to better health and fertility.
D. Declining death rates due to declining incidence of war.

Answer
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Hint: Numerous social issues are caused by population growth. People move from rural to urban regions as a result, which fuels the expansion of slum communities. Most sanitary and hygienic conditions do not exist where people live. The educated youth are frustrated and angry as a result of unemployment and poverty.


Complete step by step solution:
Causes of the Population Boom
There are a lot of different variables and causes contributing to the population expansion. These consist of:

Increase in birth rate: As a result of uncontrolled deliveries and people's ignorance, the birth rate is rising quickly. Additionally, the time between birth and death has grown far larger than we can imagine. Furthermore, compared to the death rate, the birth rate has multiplied many-fold.

A decline in the infant mortality rate—the number of infant deaths under the age of six months is referred to as the mortality rate. We have been able to reduce this rate thanks to research and technology, and today there are just a few known occurrences of death for every thousand deaths.

The increase in life expectancy- Earlier, the average person's lifespan was between 55 and 60 years. But we can now extend people's lives because of better and more advanced medical facilities. Now, a person is 70 to 75 years old on average.

Along with improving living conditions, food quality, nutrition, and cleanliness, these improvements also contributed to a longer life span.



High rate of illiteracy: One of the main obstacles to family planning is the low literacy rate of women. People in India place little value on women's education and wed them at a young age. They are therefore ignorant of the use of contraceptives and birth control measures.

Therefore option A is the correct answer i.e., declining death rates due to improved medical care.

Note:
For instance, life-saving medical advancements had extended lifespans and precipitated a sharp decline in mortality rates (mainly in industrialised nations), which had contributed to a phenomenal rise in the human population.