1. In diffusion, the net movement of a substance travels down its concentration gradient . Explain using the image below.

a. by using fur or clothes to trap heat energy near the body

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