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the most important reason is that our bones are not hollow while birds have soft and hollow bones so that they can fly .. other reasons are  wings... as we don't have wings like birds to fly and definitely our weight is much more than that of birds
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if it helped u then pls do mark it as the best :D
Human beings are not able to fly as they don't have hollow like the birds and other flying animals hve and also we do not hve feathers
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