If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries.
In case of birds, air sacs play an important role in respiratory system.
Lift heavy, eat a lot, just don’t eat a lot of BAD stuff.
?
What is the topic? what is this question?
Answer:
Nick Boyle as 270 pounds is higher than others!
Explanation:
