Bands in metamorphic rocks are formed by question 3 options:
a. different chemicals in the earth coloring the rock
b. the layering of the rock
c. the minerals and materials in the rock breaking apart and combining in a different way.
d. pressure pushing two different rocks together like a sandwich

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

i think the answer is a.keratin is the pigment responsible for skin color.