Question

Why humans cant fly?

Answer 1

because it is very heavy and no streamlined body and no hollow also

Answer 2

A bird can fly because it's wingspan and the wing muscle strength are in balance with its body size it has a lightweight skeleton with hollow bones which puts a smaller load on its wings .On the other hand calculations of the ratio between human size and strength reveal that our spcies will never be able to take flight unaided as an organism grows its weight increases at a faster rate than its strength does . An adult man human would need a wing span of at least 6.7 m to fly this calculation does not even take into account that these Wings themselves would be too heavy to function. In other words humans are not too large to fly but our strength simply cannot support our weight in flight.

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