Which of these best describes how an insect's exoskeleton is similar to a human skeleton?
F It is attached to groups of muscles.
G It is composed of the same materials.
H It is capable of producing red blood cells.
J It is periodically replaced by a new
skeleton.

i dont know this but ask your teacher for !

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