Heterosis is

Options :
  1. hybrid sterility
  2. hybrid vigour
  3. hybrid incompatibility
  4. hybrid inviability
Answer and Explanation :-

Answer: Option 2

Explanation:

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I often say that I don't worry about the meaning of life--I can't handle that big stuff. What concerns me is the meaning in life--day by day, hour by hour, while I'm doing whatever it is that I do. What counts is not what I do, but how I think about myself while I'm doing it.
-Robert Fulghum It Was on Fire When I Lay Down on It