No, fish and snakes do not have ears
The two are blood and lymph
Alveolar walls are thin to enable the quick passage of oxygen in and out of the lungs. The lungs works hand-in-hand with the heart and also is responsible in converting blood that's de-oxygenated into an oxygenated blood that is usable by the organ systems of the body. The alveolar walls are also designed to have thin membranes so that it can expand and constrict quickly allowing us to breather properly.
Answer:
"You have to believe the exercise works before you try it" would be the pseudoscientific claim.
There is a lot of organisms that can reproduce. But there is some that asexual reproduce. Bacteria reproduce so that is an example for a reproduction and the prokaryotic reproduce asexually. <span />
