Answer: Marine debris consists of most anything used and discarded by humans.
Step-by-step explanation:
The human activities like household chores, packaging and dumping wastes generated a lot of harmful wastes which cannot be treated and thus they pollute the environment.
The polythene bags, plastic sheets, and plastic broken parts of articles can become chief pollutants as they are discarded by the humans. These pollutants can be carried away by the water currents to the seashores and may deposit them in the marine debris.