Answer: This would affect the whole marine ecosystem. It would also effect the oxygen concentration inside the sea and in outer environment.
It contributes to a huge proportion of oxygen in the environment and if there is some sought of pollution in the sea then the aquatic animals will die and it will effect the other animals present in sea.
The marine ecosystem will be disturbed and the food web inside the sea will also be hampered.
Answer: Most of Earth's oxygen comes from tiny ocean plants – called phytoplankton – that live near the water's surface and drift with the currents. So, mostly from plants, trees etc...
Hope I helped!
Sugar in RNA is called Ribose similar to the sugar in DNA which is Deoxyribose
