If someone has a heavy weight on his or her chest, explain why after a short time it becomes difficult to breathe, even though the person’s mouth and nose are not affected

Breathing problems are when you feel you can’t get enough air, your chest feels very tight, you are breathless or you feel like you’re being suffocated.

You might feel short of breath if you are obese or if you have just done some strenuous exercise. It can also happen in extreme temperatures or if you are at high altitude.

If you have breathing problems for any other reason, it is probably the sign of a medical problem.

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

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