Birds are less sensitive to temporary deprivation of water, when compared to the mammals, because

Options :
  1. urea excretion in mammals entails a greater loss of water than that in birds.
  2. the water requirement per unit weight is less in birds than in mammals.
  3. absorption of water from the gut is more efficient in birds than in mammals.
  4. None of these


Answer and Explanation :-

Answer: Option 2

Explanation:

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If the Old Man said something was so, then it probably was, because he was one of these cautious babies who'll look out the window at a cloudburst and say, "It seems to be raining," on the off-chance that somebody's pouring water off the roof.
-Dashiell Hammett The Dain Curse The Glass Key and Selected Stories