Answer:
s
Explanation:
'A mark left after injured tissue has healed' is known as a scar.A scar is a zone of sinewy tissue that replaces typical skin after damage. Scars result from the natural procedure of twisted fix in the skin, just as in different organs and tissues of the body. Along these lines, scarring is a characteristic piece of the mending procedure.hence, the first letter of the word that fits this description is 's'.