Question

fill in the blank question
the blood vessel indicated by the letter a in the figure is the inferior

Explanation:

In human anatomy (a subfield of Biology, which is part of Natural Science), the inferior vena cava is a large vein that carries deoxygenated blood from the lower body to the heart. The figure likely shows the heart's blood vessels, and the vessel indicated by A (if following typical heart diagrams) corresponding to the inferior vena cava.

Answer:

vena cava