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Acar traveld with an average speed of 60 miles per hour for 2 hours. how far did it travel

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

Ascientific idea becomes valid when it is what?