MCQ
Those animals which excrete a large amount of $N{H_3}$are
- ATerrestrial
- BEgg laying
- CAmphibious
- ✓Aquatic
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$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with thoracic wall
$IV.$ Its inner layer is in contact with lungs