Veins are an important part of our circulatory system. They are responsible for returning deoxygenated blood back to the heart after arteries carry blood out. The vena cava is the largest vein in the body. Veins have much thinner walls than arteries.
Answer:
g/cm³
Explanation:
As, Density=
Mass= 30g
Volume= length×width×height
or
Volume=area×height
Here, area=4cm² and height=2cm