Answer:
A. Vena cava
Explanation:
The aorta can't be the answer because it is the largest artery in the human body and it carries oxygenated blood. The pulmonary artery carries deoxygenated blood into the lungs for oxygenation. The pulmonary veins transfer oxygenated blood from the lungs to the heart. And lastly, the vena cava is the right answer and it returns deoxygenated blood back into the heart.
Answer:
Biological aspects of the mountain region:
Biodiversity in this region is due high due to more area and vividness in climate and ecosystem. The diversity of vegetation and animals is comparatively less due to very cold temperatures. 2. This region has average fertility, with more agricultural diversity.
Physical aspects of mountain :
The Mountain region includes about 35% of the total land of the country that is 6.7 percent less than that of the hilly region. The Mountain region has a higher altitude (4,877-8848 meters) from sea level. ... This region contains a number of deep and narrow gorges, plains, and valleys with slightly less coldness.