Marine debris is best described as being composed of

Marine debris consists of most anything used and discarded by humans.

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.

answer; ///i believe the answer your looking for is (ribosomes);

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.