The fda has set a reference daily intake for how many minerals?

Whole grains 70 mcg * The Daily Values are the amounts of nutrients recommended per day for Americans 4 years of age or older. Immune function

Explanation:

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers