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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Microplastics are so ubiquitous that Sletten and her colleagues had to pre-filter the water they were using to process and prepare the seal stomachs to prevent adding plastics and messing up their count.
Source: http://www.nomenugget.net/news/microplastics-found-stomachs-spotted-seals