How many organisms in the list given below respire through gills?
Sponges, Coelenterates, Flat worms, Aquatic arthropods, Molluscans, Fishes, Tadpoles, Reptiles, Aves, Mammals.

Three

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Six

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Two

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Four

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Solution

The correct option is A Three
Fishes and tadpoles are the organisms among the given options that breathe through gills. Molluscs too breathe using gills called ctenidia as shown in the sea slug, Pleurobranchaea meckelii. It sit in a cavity between the mantle and body mass.
So the correct option is 'three'.

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How many organisms in the list given below respire through gills?Sponges, Coelenterates, Flat worms, Aquatic arthropods, Molluscans, Fishes, Tadpoles, Reptiles, Aves, Mammals.

How many organisms in the list given below respire through gills?
Sponges, Coelenterates, Flat worms, Aquatic arthropods, Molluscans, Fishes, Tadpoles, Reptiles, Aves, Mammals.