Question

ON A SUNNY DAY BUBBLES OF GAS COMES OUT OF WATER IN A POUND IN WHICH ALGAE ARE GROWING . WHY?

Answer 1

After the sun came up, they began to break up and were gone within ... mat that has trapped bubbles of gas, produced by the cyanobacteria.

Answer 2

Blue Green Algae or Cyano bacteria bcoz they often bloom in polluted water bodies.

Hope it helps.
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