C. Heat
When heat is added to a substance, the molecules and atoms in that substance vibrate faster and move farther apart, and when a substance is cooled, the molecules vibrate slower and move closer together.
For example, as ice is warmed, the energy from the heat causes the molecules of water to move faster and farther apart, causing it to melt and liquify.
Answer:
A. The Mysterious dark matter is the fastest-moving material in the universe
Explanation:
Everything in the Universe is in motion because forces exist in the Universe. The gravitational force and the electromagnetic force ensure large objects are in motion while the weak and strong nuclear forces ensure the quantum world is constantly in motion. If there were no forces, there would be no motion.
This motion is the most obscure as it is not physical motion as such, but rather a change in the very nature of the universe. The primary source of verification of this expansion was provided by Edwin Hubble who demonstrated that all galaxies and distant astronomical objects were moving away from Earth, known as Hubble's law, predicted by a universal expansion.
