How long is the dna is found in a cells nucleus

The length of DNA found in a cells nucleus is 3km. It is the equivalent distance of the Lincoln Memorial to the capital in Washington, DC.

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