Explain the origin, expansion, and scale of theuniverse, using astronomical evidence for the origin of the universe. Please help!

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

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