LIFE SCIENCE

Detailed explanation-1: -Darwin’s finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds. Ancestral seed-eating stock of Darwin’s finches radiated out from South America mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats.

Detailed explanation-2: -On the Galápagos, finches evolved based on different food sources-long, pointed beaks served well for snatching insects while broad, blunt beaks work best for cracking seeds and nuts.

Detailed explanation-3: -1: Darwin’s Finches: Darwin observed that beak shape varies among finch species. He postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources.

Detailed explanation-4: -The most important differences between species are in the size and shape of their beaks, which are highly adapted to different food sources. The birds are all dull-coloured. They are thought to have evolved from a single finch species that came to the islands more than a million years ago.

Detailed explanation-5: -Different finch populations evolved to eat different food sources. Some finches on some islands evolved thin, sharp beaks that helped them to eat insects and the blood other larger animals; on other islands, finches evolved large, sturdy beaks ideally adapted to eating seeds, berries and nuts.