Two students spotted some white, eyeless crayfish in the darkness.
Why are the crayfish eyeless?
A.
They have long legs, so they don't need eyes.
B.
They are white, so they don't need eyes.
C.
There is natural light in the dark zone, so they don't need eyes.
D.
There is no natural light in the dark zone, so they don't need eyes.
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