Which observation(s)of the medium ground finch (Geospiza fortis)by Peter and Rosemary Grant verify Darwin's selection hypothesis? Check all that apply.

Question

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- A) The observation of considerable variation in beak size and shape among the medium ground finches supports Darwin's idea that variation within a population is crucial for natural selection to occur.- C) The variation in beak shape with the dryness of the year demonstrates natural selection in action, as different environmental conditions favor different physical traits.- D) The similarity of offspring to parents in terms of beak size and shape indicates that these traits are heritable, a key component of Darwin's theory of natural selection.

Which Observation(s)of the Medium Ground Finch (Geospiza Fortis)by Peter and Rosemary