The respiratory system
to be honest i don't know and i could care less :)
Alveoli is simply the plural form of alveolus.Alveolus = singularAlveoli = plural
you have to know about the body and the
i dont know??????????
The oxygen in each breath is circuited to the lungs where the alveoli absorb the oxygen and passed to the blood cells. The blood cells enter the heart where the oxygenated blood is circulated where needed.
the snake doesn't know if it has a skeleton while the human does.
The Endocrine System is actually a system of it's self. It contains the thyriod and the pituitary gland and the like, But it is not contained within another system if that is what you are asking. :) Katie.
one feature is that an alveoli has a wide surface area. If you know any other features then add them!
It is the only planet that we know of that contains life.
1.nervous system (it controls everything from your toes to your heart) 2.circulatory system (makes the blood with the help of lungs) 3.respiratory system (collects oxygen with alveoli in the lungs) 4.digestive system (digests food, starts from the mouth, through the esophagus, then to the stomach, next the small intestine, finally the large intestine) 5.urinary system/renal system (produces, stores, and eliminates wastes from the body) There are other systems in the human body, for example the reproductive system. I do not know much about the reproductive system and the others at this current moment and I am uncomfortable talking about them. Thanks for reading! :)
Only the Earth, as far as we currently know.
i don't know... maybe to keep the human race alive?