Ocean pollution: affects the amount of oxygen in the atmosphere is a result of coastal cities dumping sewage is caused by super tankers that spill oil all of the above

All of the above

Explanation:

The pollution of the oceans is causes a wide number of adverse effects on a community. As a result of the pollution of the ocean, many aquatic plants die to which the oxygen gets depleted in the atmosphere.

One of the major causes of the ocean pollution is the huge piles of wastes that the people dump in oceans. This dumping causes various harmful and toxic substances to be released in the water which causes death of the organisms living in the oceans.

Another major threat to the oceans is the spilling of oil which causes the death of many marine organisms and pollutes the water.

exercising at a moderate intensity, and slowly increasing the duration.