H5n1 avian flu virus have spread from asia to africa and europe? is it likely that human air travel could have spread this virus?

Yes, it is very likely.

Explanation:

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not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.