The answer is C.) Sac. More formally known as the amniotic sac. It's also sometimes called the bag of waters.
<span>immigration, emmigration, and extinction events.</span>
True.
<span>The trachea is about 10 cm long and it has an approximate diameter of 2 cm. It is located anterior to </span>(in front of) the esophagus and posterior to (behind) the isthmus of the thyroid. The right and left main bronchi are branches of the trachea. This division occurs at the level, or just below the level, of the sternal angle, also known as the manubriosternal joint.
