Which of the following is biomass

Options :
  1. cow dung
  2. petroleum
  3. natural gas
  4. all the above

Answer and Explanation :-

Answer: Option 2


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Mockingbirds don't do one thing but make music for us to enjoy. They don't eat up people's gardens, don't nest in corncribs, they don't do one thing but sing their hearts out for us. That's why it's a sin to kill a mockingbird.
-Harper Lee To Kill a Mockingbird