Why is a "shell of hydration" important to life?

a. it allows minerals and ions to easily dissolve in bodies of fresh water
and ocean water.

b. it facilitates the conversion of drinking water into cellular water.

c. it keeps substances, such as vegetation, from freezing in very cold
temperatures.

d. it allows a variety of substances to dissolve in and around cells.

i won't lie i don't know so go online and ask google thats what i do

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.

if you listed your answers right then i believe your answer is b.