why is the ablity to regrow cells important for healing people?

Answer 1

The body's ability to regrow cells is important, why, if we were unable to do this then a simple wound would remain there forever since no new cells are being made to replace the damaged cells.

BTW scabs are formed by platelets in a process called blood clotting.

Answer 2

For example, it helps grow new skin cells. Let's say you scraped you knee. Your body protects the wound by growing special skin cells over the wound called a scab.