Gills (worm)
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This illustration shows a transverse section of a worm with external gills. Gills are the breathing organs of aquatic animals.
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2297×868, 392.8 KiB
1024×386, 64.2 KiB
640×241, 33.1 KiB
320×120, 13.0 KiB
This illustration shows a transverse section of a worm with external gills. Gills are the breathing organs of aquatic animals.
2297×868, 392.8 KiB
1024×386, 64.2 KiB
640×241, 33.1 KiB
320×120, 13.0 KiB