How does water affect metamorphic processes?
a. it decreases the rate at which metamorphic reactions take place.
b. it prevents the transfer of ions between and within minerals.
c. it stops elements from moving around within earth's crust.
d. it can have elevated concentrations of dissolved substances.

it can have elevated concentrations of dissolved substances

Explanation:

Water is widely regarded as a universals solvent. During a metamorphic process, the presence of fluids most especially water cannot be over emphasized.

Water in metamorphic processes helps to concentrate dissolve materials and moves them from one point to another within the crust. By so doing, water helps to facilitate the rate at which the reaction and transformation occurs. Water available for metamorphic processes usually have elevated temperature, this would further aid to catalyze the transformation work on the rock.

Water plays nearly the same role as pressure and temperature in a metamorphic reaction. It serves as the mobile unit to move materials from one point to the to another. The water concentrates the dissolve materials that comes in contact with it and utilizes it to further produce new metamorphic minerals. Generally, fluids allow for better mobility.

format change of dna.  

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called