Why can't people live in water, i mean were made of mostly water anyways.....
The reason people can't live in water is because we need oxygen. We don't have a breathing mechanism that will help us get the oxygen that's in the water. This means we'll die of suffocation caused by drowning when put in water.
go under water, take a deep breath and then you will find out why
Cause we are mammals. Even dolphins and whales hold their breath while under water.