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Examples of external body part
external body part
The nymphs physically resemble wingless adults, but often have external gills, which may be present on almost any part of the body.
From the en.wikipedia.org
Th17 cells are part of the immune system and are found where the body comes in contact with the external environment, such as the lungs and the lining of the gastrointestinal tract.
From the sciencedaily.com
