21. (a) Mention the characteristic features found in the respiratory organs of
the terrestrial organisms.
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2
Answer:
The essential feature of respiratory organs of terrestrial animals is that they must be protected under layers of tissue so as to avoid any shock or damage. They must also be supplied with a large number of blood vessels for easy and fast exchange of gases.
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Answer:
respiratory organs like lungs in terrestrial animals help them to breathe
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