Consider the following statements:1. As per the optimum theory of population per capita income will increase with the population growth in underpopulated areas.2. According to Malthus, Population doubles once in every 20 years.3. Celibacy, self-control and late marriages are the preventive checks postulated by Malthus.4. According to Malthus, war, earthquake and flood are some of the positive checks on population growth. Of these statements

The world population is the total number of humans currently living. It was estimated by the United Nations to have exceeded eight billion in mid-November 2022. It took around 300,000 years of human prehistory and history for the human population to reach one billion and only 222 years more to reach 8 billion.