Natality -mortality number percentage ratio is called

Options :
  1. bio indicator
  2. population density
  3. population number
  4. reproductive power

Answer and Explanation :-

Answer: Option 4


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Who is it who decides that one man should live and another should die? My life wasn't worth any more than his, but he's the one who's buried, while I get to enjoy at least a few more hours above the ground. Is it chance, random and cruel, or is there some purpose or pattern to all this, even if it lies beyond our ken?"-Roran
-Christopher Paolini Inheritance