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Genetic drift happens by chance and can make an allele disappear completely from a gene pool, even if it was a desirable trait that should have been passed down to offspring. The random sampling style of genetic drift shrinks the gene pool and therefore alters the frequency the alleles are found in the population.
They are distinguished by proteins on the erythrocytes.
100% (all living organisms of them have a rage of tolerance)
c. Adenomyomatosis. it's an abnormality of the gallblader mucosa