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Concern about floods is such that accurate flood-hazard maps are now available for all streams in the United States.
Photoreceptors
Cells in the retina of the eye that respond to light, crucial for vision.
Ganglion Cells
Neurons located in the retina that receive visual information from photoreceptors via intermediate bipolar cells and transmit it to the brain.
Optic Nerve
The nerve that transmits visual information from the retina to the brain.
Retina
A layer at the back of the eyeball containing cells that are sensitive to light and trigger nerve impulses that pass via the optic nerve to the brain.
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