Most likely because the new skin from the skin graft is considered foreign and the body's initial response is to fight off foreign bodies. But the patient wants their body to accept the new skin so they take drugs to suppress the immune system's innate response to reject the skin.
Answer:
this represents response to the environment
There are three major forms of fossil fuels and these are coal, oil and natural gas. All three were formed many millions of years ago before the time of dinosaurs.
Plants and trees died and sank to the bottom of swamps which filled the land. The dead matter formed layers of a spongy material called peat. Over time the peat was covered by sand, clay and other minerals which turned into sedimentary rock.
As the layers of rock piled up, their weight squeezed the peat until water came out of it and it eventually turned into coal, oil and natural gas.
the layer on the top. the layer with the most minerals.
