EVOLUTION
EVIDENCE FOR EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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similarities of the birds’ embryos.
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birds’ different-shaped beaks.
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length of the birds’ necks.
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number of eggs in each bird’s nest.
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Detailed explanation-1: -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-2: -He noticed that each finch species had a different type of beak, depending on the food available on its island. The finches that ate large nuts had strong beaks for breaking the nuts open. Finches that ate small nuts and seeds had beaks for cracking nuts and seeds.
Detailed explanation-3: -It is thought that their ancestor, and closest known relative, is the dull-coloured grassquit, which is found on mainland South America. Once the original grassquits arrived at Galapagos, they diversified and adapted to the different environments found on the Islands, eventually becoming different species.
Detailed explanation-4: -The Galápagos finches are a classic example of adaptive radiation. Their common ancestor arrived on the islands a few million years ago. Since then, a single species has evolved into different species that are adapted to fill different lifestyles.