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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.
Tardigrades are about 0.5 millimeters in length, so in the right conditions you might be able to see them with the naked eye, but in general, they need a microscope in order to be seen.
Source: https://www.vaildaily.com/opinion/curious-nature-what-the-heck-are-tardigrades/