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2
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Indeviduals select mates based on heritable traits such as size, strength or coloration.
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3
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happens when two or more species reproduce at different times.
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4
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Nature provides the variations and humans select those they find useful.
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5
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Two pop'n capable of interbreeding develope differences in courtshio rituals or other behaviors.
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6
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When pop'n are seperated by barriers such as rivers, mountains or bodies of water.
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7
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Movement of individuals into an area occupied by existing pop'n.
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9
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slow steady pace of geoligic change.
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12
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Two populations become reproductively isolated and they can evolve into two seperate species.
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15
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Movement of indeviduals outside an area.
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