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What contributed to the natural selection of the finches' beaks? Select all that apply.

- Eating tough seeds made each finch's beak thicker.
- The insect-eating finches were the best adapted of all the finches.
- Variation for beak size existed within the population.
- Beaks better suited for different food sources.

Answer :

Genetic variation in beak size and suitability for different food sources contributed to the natural selection of the finches' beaks. Birds with better-suited beaks for available food had a survival advantage. Key factors include variation for beak size and adaptability to different food sources c & d).

The natural selection of finches' beaks was influenced by several factors:

  • Variation for beak size existed within the population. This genetic variation allowed some birds to be better suited to different food sources.
  • Finches that were better suited for different food sources had a survival advantage. For example, seed-eating birds developed thicker, stronger beaks to break hard nuts, while insect-eating birds evolved sword-like beaks for stabbing insects.

Therefore, the statements that contributed to the natural selection of the finches' beaks are:

  • Variation for beak size existed within the population.
  • Better suited for different food sources.

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