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How would Earth be different without photosynthesis?
Fovea Centralis
A small pit in the retina of the eye where visual acuity is highest, due to the concentration of cone cells.
Lens
An optical device made of transparent material that affects the focusing of light rays to form images.
Rods
Light-sensing nerve cells in the eye, at the posterior of the retina, that function in dim light but do not provide sharp images or detect color.
Cones
Light-sensing nerve cells in the eye, at the posterior of the retina, that are sensitive to color, provide sharp images, and function only in bright light.
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