Answer:
A large vein that carries blood to the heart from other areas of the body. The vena cava has two parts: the superior vena cava and the inferior vena cava. The superior vena cava carries blood from the head, neck, arms, and chest.
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Hi pulil here is your answer :::
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1》The answer of the First question is option A Diffusion.
The net movement of the molecule from a region of higher concentration to the reagion of lower concentration is called diffusion. And in this case also this process is takong place. So the answer is Diffusion.
2》The answer of the Second question is also Option D Diffusion.
Diffusion is the process of movement of molecules from higher to lower concentration.
So, uour answer is Diffusion.
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Hope this helps .........