Suggests why we are unable to breath underwater without special brathing apparatus?

As the lungs branch into smaller and smaller airways, the end in specialized sacs called alveolae. Here, oxygen passes through the lung membranes into the bloodstream, and waste products like carbon dioxide flow out of the blood and into the air, and are subsequently expelled when you breathe out.

Fish also need oxygen to live, but their lungs are not designed to extract oxygen from the air.

your a sped   no one cares

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)