Explain the given line = " All birds have a certain amount of local movement, caused by the hardships of living and the degree of change in food supply. "
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Answer: they need to keep migrating because the season changes and they have a hard time finding food and shelter in new places
Explanation:
local movement = In many cultures, the movement, appearance or disappearance of migratory birds is an indication of seasonal change.
hardship = severe suffering or privation.
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