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2007-11-03 08:22:13 · 1 answers · asked by bamidele d 1 in Science & Mathematics Medicine

1 answers

The human retina which receives and processes the light images is made up of living cells requiring oxygen and an energy source that is nutritional rather than electronic.
The lens and aperture are also composed of living cells and controlled (the aperture) by human muscles which automatically control the light admitted.

2007-11-03 11:04:23 · answer #1 · answered by Spreedog 7 · 0 0

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