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प्रश्न
Select the most appropriate answer.
Bones with large air cavities are present in
a. cnidarians.
b. fish.
c. annelids.
d. birds.
विकल्प
cnidarians
fish
annelids
birds
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उत्तर
birds
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संबंधित प्रश्न
Fill in the blank.
Annelids have special organs of excretion called ..............
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A ................. has an external coiled shell.
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Vertebrates which spend a part of their life on land but reproduce in water are called ..................
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ant, cockroach, spider, dragonfly
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