I need help answering the mass change part

age range would be the answer

when it is at an intermediate population density

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

answer/// to address the needs of adults with mental illness and increase their ability to function;