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  1. The lower most layer of atmosphere in which man and other living organisms exist
  2. Which one of the following is an example of Ex situ conservation?
  3. The transmission of nerve impulse from one neuron to other, is faciliated by
  4. An abnormal human male phenotype involving an extra X chromosome(XXY) is a case of
  5. The earth is believed to be 4,500 million years old, life on this planet