Why is skin grafting necessary in third-degree burns

A third-degree burn is the most serious type of burn, as it involves all layers of skin and can severely damage muscle and tissue. Skin grafting is necessary to provide a protective layer for the burned area so that it is able to heal. It acts as a protective barrier so that bacteria isn't able to infect the burned portion of skin and reduces the course of treatment needed.

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lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.