Stratification exists in every culture that anthropology has studied, but systems of stratification such as class are not considered intrinsic to human culture. these seemingly contradictory ideas might be resolved through archaeological evidence. what aspect of human social behavior lends itself to a nonstratified society, according to archaeological findings?

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