Pheromone is

Options :
  1. a product of endocrine gland
  2. used for animal communication
  3. mRNA
  4. always protein

Answer and Explanation :-

Answer: Option 2


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Let not thy heart cling to the things which for so short a time deck out thy life. Let him who has, learn to lose, and him who is happy, familiarise himself with what may give pain.
-Friedrich von Schiller The Bride of Messina