Which is the most common cause of delayed healing of a skin wound caused by a traffic accident?

The most common cause of delayed healing of a skin wound caused by a traffic accident is INFECTION.
Infection refers to the invasion and multiplication of harmful microbes in a wound. These microbes usually produce toxins that will prevent the wound from healing up. This could be very fatal to the health of the patient if not quickly treated.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem