Question

which of the steps in this sequence of events is an example of mitosis at work?
a baseball hits the arm of a baseball player.
the player reacts quickly grabbing his arm.
a bruise forms where the ball hit the arm.
the bruise slowly disappears as the arm heals.

Explanation:

Mitosis is a process of cell division that helps in growth, repair, and replacement of cells. When a bruise heals, new cells are produced through mitosis to replace damaged cells. The other options do not directly involve cell - division processes related to mitosis. The first two options are about immediate physical reactions and the third is about the initial formation of a bruise due to blood vessel damage, not cell division for repair.

Answer:

The bruise slowly disappears as the arm heals.