cardboard piece in the center. She uses sand to simulate X-ray radiation, sprinkling it over the screen. Upon removing the screen, she observes an outline of the square cardboard. What does the cardboard symbolize in her simulation? (1 point)
o the bones that look white in an
X-rav
O teveins that look white in an O *everson being scanned with
the areas that remain black on
the X-ray