Apopulation of black cats has been interbreeding. however, in one litter, a sole gray kitten is born. the successive generations now have a few gray cats. which mechanism is responsible for introducing this new allele in the cat population? gene selection gene mutation gene flow genetic drift

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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