Pheromone traps have

Options :
  1. sterile males
  2. male pheromones
  3. female pheromones
  4. sterile females

Answer and Explanation :-

Answer: Option 3


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Bottom line is, even if you see 'em coming, you're not ready for the big moments. No one asks for their life to change, not really. But it does. So what are we, helpless? Puppets? No. The big moments are gonna come. You can't help that. It's what you do afterwards that counts. That's when you find out who you are.
-Joss Whedon