An environmental change gave one phenotype an adaptive advantage over the others, increasing its fitness. This would cause a shift in allelic frequencies as the fittest beads are best able to survive and reproduce. Would this be an example of genetic drift? Why or why no

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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that is wrong, its not thymus.

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on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.