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.
Meninges are membranes that cover and protect the brain and spinal cord.
There are three layers of meninges: Dura mater (closest to the bone), Arachnoid loosely around the brain, Pia mater is closely attached to the brain and spinal cord surface.
All characteristics of life rely on the sun.
Answer:
Genotypes determine the phenotypes expressed
Explanation:
Earth Science is a brand of science that studies the earth and the atmosphere. The topic can be among the following: geology, meteorology, and oceanography. More specifically, the topic could be about any of the following: volcanoes, the weather, or tides and storms.
