Migratory birds fly to far away areas during a particular time of a year.
Migratory birds fly to far away areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour?
(i) Unavailability of food.
(ii) Extreme weather conditions.
(iii) Over crowding.
(iv) Lack of nesting areas.
(a) ii & iii; (b) i & ii; (c) i & iv (d) ii & iv.
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