The book ‘On the Origin of Species’ was published in 1859.This book describes the theory of evolution. One chapter of this book discusses pentadactyl limbs.Another chapter of the book discusses how the shape of bird beaks has evolved on different islands. Two species of finch evolved from a common ancestor that had a similar shaped beak to species B. Beak shape is related to the food that the finches eat. Describe how the thinner beak of species A is a result of evolution – 10020

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1. In a population of finches, there was variation in beak shape because of mutations that occurred in some birds. These mutations changed the shape and size of their beaks. Some finches ended up with thinner beaks than others.

   In the environment of finch A, the food available—like small insects or seeds hidden in narrow spaces—could be caught or extracted more easily by birds with thinner beaks. This made the thinner-beaked birds better adapted to the environment compared to those with thicker beaks.

   Because the thinner-beaked birds were more successful at getting food, they were more likely to survive and reproduce. They outcompeted the birds with thicker beaks, who found it harder to access food and were less likely to survive.

   As a result, more of the birds that survived and had offspring were the ones with thinner beaks. They passed on their alleles (genes) for thin beaks to their young. Over many generations, the number of birds with thinner beaks increased, and this trait became more common in the population.

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