The green plants are grown in aquarium for

Options :
  1. CO2
  2. O2
  3. fish food
  4. none of these

Answer and Explanation :-

Answer: Option 2


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Everywhere I looked, hope existed - but only as some kind of green shoot in the midst of struggle. It was a theological concept, not a spiritual practice. Hope, I began to realize, was not a state of life. It was at best a gift of life.
-Joan D. Chittister