So, we know that a metamorphic rock is either an igneous or a sedimentary rock that are exposed to intense heat and pressure.
But when the metamorphic rock is thrusted deep underground through subduction, it will again be subjected to intense heat. This can cause it to melt, turning it into a magma. When the magma cools down, it again becomes an igneous rock and the rock cycle continues.
From lowest to highest hierarchy it would be: planet, star, solar system, galaxy.
The answer is B. Chromosomes which you get from your parents
"Diabetes" is one of such diseases which cause an imbalance of the blood glucose levels.
Hope this helps!
Vein because they have valves to prevent back flow of blood.