Answer:
The left side of the heart receives oxygenated blood from the pulmonary vein and pumps it into the aorta, while the right side of the heart receives deoxygenated blood from the vena cava and pumps it into the pulmonary vein. The pulmonary vein and aorta also have valves connecting them to their respective ventricle.
Explanation:
I think the answer would be B. Genealogy.
Answer:
I believe a layer deep underground would have older things, because the ground could erode over time causing the fossil to sink into the ground.
It’s the first one for sure
