Backward chaining starts with a goal then searches back. Forward chaining starts with facts and searches forward.
There is a physical barrier (small village in a mountain valley) that does not let those traits to escape the region. In other words, the physical barriers prevent gene flow occurring. This is what makes that specific gene for polydactylism to be prevalent in that area.
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Bio-metrics are automated methods of recognizing a person based on a physiological or behavioral characteristic. Among the features measured are face, fingerprints, hand geometry, handwriting, iris, retinal, vein, and voice.
The scanner uses a light-sensitive microchip, either a CCD, charge-coupled device, or a CMOS image sensor, to produce a digital image. The computer analyzes the image automatically, selecting just the fingerprint, and then uses sophisticated pattern-matching software to turn it into a code.
The technique relies on capturing an optical image, essentially a photograph, and using algorithms to detect unique patterns on the surface, such as ridges or unique marks, by analyzing the lightest and darkest areas of the image.
They are crossing the membrane so
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