Hey,
Answer:
<em>The National Center for Missing & Exploited Children (NCMEC):</em>
A. Facilitates the identification of children and their reunification.
<h3>The blood in the pulmonary artery is going to the heart to collect oxygen, and therefore has a low content of oxygen. So, the blood in the pulmonary artery is a violet colour because it has low oxygen. The blood in the pulmonary vein is oxygen rich, and so it gives a scarlet</h3>

A) they allow an athlete to exercise longer
(i just took the quiz)