When placed in an infant walker, an infant will often be able to walk or move from place to place using a walking pattern. What rate limiter does an infant walker overcome or adjust for?

they are known to reach a speed of 21 miles per hour

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