Answer A. If the tectonic plates continually move then they change earth’s crust constantly.
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.
Explanation:
if u read the passage then u would know it so i prefer going thru passage and reading questions
Calm waters <span>theory of organizational change</span>
Layer c is the oldest and then it’s b and a
