The global population reached the 7 billion milestone in 2011. While the population has continued to grow toward 8 billion in recent years, 7 billion remains the most accurate choice among the provided options, reflecting the demographic trends observed in the early 21st century.

The population growth rate is calculated by combining the natural increase (births minus deaths) with the net migration rate (immigration minus emigration). Since the options provided only list partial components of this calculation, 'none of the above' is the correct choice as it requires both natural change and net migration to determine the total growth rate.

Thomas Malthus argued that population growth tends to outpace food production, leading to inevitable misery. He proposed 'moral restraint,' specifically the postponement of marriage, as the primary way to limit population growth. He was generally opposed to artificial birth control, viewing it as contrary to moral principles, and focused on individual responsibility rather than state-mandated population control policies.

Overpopulation exerts significant pressure on resources and economic systems. It often correlates with increased poverty levels, reduced per capita income due to the dilution of resources among a larger population, and food insecurity resulting from the inability of agricultural production to keep pace with rapid demographic growth.

Overpopulation is defined not merely by the number of people in a given area, but by the relationship between the population and the available resources. When the demand for resources such as food, water, energy, and infrastructure exceeds the carrying capacity of the environment or the economic system's ability to provide for the population, the country is considered overpopulated.

Overpopulation occurs when the number of people exceeds the carrying capacity of the environment and the available economic infrastructure. This imbalance frequently leads to increased competition for limited jobs (unemployment), rising costs of living due to high demand for goods (inflation), and a general decline in the standard of living, which exacerbates poverty levels within a society.

Overpopulation is a condition where the number of people in an area exceeds the capacity of the environment to support them at a reasonable standard of living. It is not merely about the total number of people, but the relationship between the population size and the available resources, such as food, water, and infrastructure. When resources are insufficient to meet the needs of the population, the society is considered overpopulated.

Overpopulation places immense pressure on a nation's socio-economic systems. It often leads to high unemployment as the labor supply exceeds job creation, inflation due to increased demand for limited goods and services, and widespread poverty as resources become increasingly scarce and inaccessible to the most vulnerable segments of the population.

Sweden consistently maintains one of the lowest infant mortality rates in the world due to its comprehensive universal healthcare system, high standard of living, and robust social support programs for families. While other developed nations like Canada and the USA also have relatively low rates, Sweden's public health infrastructure and social welfare policies contribute to superior outcomes in neonatal and infant survival.

The United Nations has projected that by 2025, the average life expectancy worldwide will reach 71 years, indicating a steady increase in human lifespan due to advances in healthcare and living standards.