According to the text, the size of most pieces of garbage is quite small and this is a different feature than many people expect.
Therefore, we can say that the last answer option is the correct one.
The Great Pacific Garbage Patch is made up of an overwhelming amount of rubbish, mostly plastic. This stain provides a great level of pollution to the pacific, mainly, because the plastic decomposes into very small particles, contrary to what people think, and ends up being eaten by marine animals, which do not digest the plastic and end up dying.
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