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Signify the term - opercular gill.
The gill found in bony fish. Operculum is the outer covering of the gill. When it's drawn away from the body, it pulls water inside the buccal cavity across the gills. This motion, in combination with opening and closing of the mouth, aerates the fish gills.
Q. In 1665 Robert Hooke, an English scientist, published his book Micrographia, in which he explained that pieces of cork viewed under the microscope presented small cavities simil
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what are viroids
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plz give the classificational chart of animals upto speceis level
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