Nucleotides variability and average heterozygosity
It was probably because when a area had too much pollution, they could easily migrate away somewhere else by flying, while humans have to stay everywhere. Another reason could've been that birds can adapt to places quicker than other animals.
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By changing allelic association recombination can aid solution, either helping to bring two beneficial alleles from an otherwise well adopted genome. He natural selection only acts on the population heritable traits selecting for the beneficial alleles and thus increasing their frequency in the population, while selecting against deleterious alleles and thereby decreasing their frequency as the process known as adaptive evolution
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reason for studying human genetics is that it gives us a powerful tool for understanding and describing human evolution. At one time, data from physical anthropology (including information about skin color, body build, and facial traits) were the only source of information available to scholars interested in tracing human evolutionary history. Today, however, researchers have a wealth of genetic data, including molecular data, to call upon in their work.
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4. p.complement system c.saliva b.sneezing