Is the parent amoeba exist.yes or no, reason.

Yes, the parent amoeba do exist

Sulfur oxide,carbon dioxide and Nitrogen Oxide are acid anhydride.

Explanation: they are refer to as acid anhydride, because when they dissolved in water,they make the water acidic by reducing the Ph of the water.These gases are greenhouse gases that are released into the atmosphere by human activities like combustion, burning of bushes etc,.when they are released into the atmosphere and have contact with atmospheric water, it leads to acidic rain.