1 and 4. At first glance, 3 seems like an obvious choice, but a state would not create and enforce national guidelines.
Answer:
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. The pulmonary vein empties oxygen-rich blood, from the lungs into the left atrium.
Explanation:
hope this helps...
and if u didn't get it its veins...
Answer:
The study of the development, structure, and functioning of human society.
The study of social problems. The science of society. It explores the influences and consequences of social behavior.
Explanation:
