What was the only type of life on planet for hundreds of millions of years?

if someone had the list of traits you provided

japan is the correct anwser because i already took the test and i passed it

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; neuropathic pain;