The primary cause behind the rapidly growing population of the world is recent time is

Options :
  1. improvement in the standard of living
  2. decrease in that death rate
  3. increase in birth rate
  4. heating of earth
Answer and Explanation :-

Answer: Option 2

Explanation:

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Call me not wise unless you call all men wise. A young fruit am I, still clinging to the branch and it was only yesterday that I was a blossom. And call none among you foolish for we are neither wise nor foolish. We are green leaves upon the tree of life and surely life itself if beyond wisdom and surely beyond foolishness.
-Kahlil Gibran The Garden of The Prophet