Population explosion is:

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(B) Population explosion refers to the rapid increase in the size of a population over a relatively short period.Rapid growth is often referred to as

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Rapid increase in population number

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(B) Population explosion refers to the rapid increase in the size of a population over a relatively short period.Rapid growth is often referred to as exponential growth. In $1700 \; AD$, the human population was about $0.6 \; 	ext{billion}$. At the beginning of the twentieth century, it increased to $1.6 \; 	ext{billion}$, and by the end of the century, the human population reached $6.1 \; 	ext{billion}$. This dramatic rise is termed population explosion.To illustrate, in the $150 \; 	ext{years}$ from $1700 \; AD$, the human population doubled from $0.6 \; 	ext{billion}$ to $1.2 \; 	ext{billion}$. In contrast, it increased five times during the next $150 \; 	ext{years}$. By $2011$, it reached $7 \; 	ext{billion}$.

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