ZZ/ZW type of sex determination is seen in -------

Options :
  1. platypus
  2. snail
  3. peacock
  4. cockroach
Answer and Explanation :-

Answer: Option 3

Explanation:

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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