Question

why we can't fly ??

why we can't live underwater ?
​

Answer 1

Answer:

We need to overcome our own weight—that is, the force of gravity. To overcome gravity, we need to create an upward force called lift. To create lift, we need to generate thrust for forward motion. To keep moving, we need to overcome the resistance of the air—a force called drag.

Humans cannot breathe underwater because our lungs do not have enough surface area to absorb enough oxygen from water, and the lining in our lungs is adapted to handle air rather than water.