Question

why cannot humans breath under water ? how can a blue whale of big size can survive under water?​

Answer 1

Explanation:

Human lungs are not designed to extract oxygen from water to be able to breath underwater. ... Fish also need oxygen to live, but their lungs are not designed to extract oxygen from the air. Instead, by passing the water through their specialized organs (called gills), they can remove the oxygen and eliminate waste gase

Answer 2

Answer:

Human lungs are not designed to extract oxygen from water to be able to breathe underwater.

Because they live underwater, blue whales need highly efficient lungs to survive. Their lungs exchange 80-90% of oxygen, as opposed to humans who only exchange 10-15%. The trachea extends all the way to the centre of the lungs to help adapt to its diving habits.