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One difference between X-raying a human and an insect is that if a medical X-ray machine was used on an insect, virtually 100% of the X-rays would pass through its body, and there would be no contrast in the image produced. Which statement explains why there is no contrast in X-ray images of insects when using a medical X-ray machine?
a) Insects have less dense tissue compared to humans.
b) Insects have more dense tissue compared to humans.
c) Insects have a higher water content compared to humans.
d) Insects have a lower water content compared to humans.