Which statement about the giraffes explains their evolution based on Charles Darwin’s main points?

Darwin’s explanation relies on inherited variation and natural selection. If some giraffes were born with longer necks because of random genetic variation, they could reach more food and were more likely to survive and reproduce, passing on the trait. Over generations, long necks became more common. Choice C describes this gradual change; choice A instead suggests that giraffes lengthened their necks by effort during their lifetimes.

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