Sears Tower in Chicago is 443 meters tall. How long would it take a rock dropped from the top to reach the
ground if it starts from rest?

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Answerboth technicians (a) and (b);

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.