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  1. What is common between parrot, platypus and kangaroo?
  2. Which of the following is the source of energy for muscle contraction?
  3. The leaf less stem of onion,which is produced to bear flower is called
  4. When you hold your breath, which of the following gas changes in blood would first lead
  5. In angiosperms each microspore mother cell undergoing meiosis gives rise to