Darwin's ideas fell into place while contemplating finches from the Galapagos Islands barnacles from Asia giant tortoises from the African coast eagles from the Andes Mountains
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Step 1: Darwin's theory of evolution by natural selection was inspired by his observations of finches on the Galapagos Islands. Show more…
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As Darwin completed his five year voyage as naturalist aboard the __________, he made numerous observations that influenced his ideas on natural selection. Along the east coast of South America, he noticed that their __________ appeared very similar to the __________ of Africa. However, they could not be related as they belonged to different continents, therefore their similarities must be due to their __________ environments. On the Galapagos Islands, he noticed that marine iguanas were uniquely adapted to their environments with their large __________ to cling to rocks and their __________ snouts to gather algae. Also on the Galapagos Islands, he noticed that while the island __________ were similar in appearance, the size of their __________ differed. Darwin speculated that these species arose from a mainland population. Because of their __________, they developed their own adaptations to their environments.
Adi S.
Complete the following paragraph to describe Darwin's study of biogeography. Labels may be used more than once. Patagonian hares guinea pigs environment convergent evolution rheas longitudes latitudes divergent evolution speciation finches As Darwin sailed around South America, he had opportunity to compare the Patagonian hares of the grasslands with the animals commonly found in the grasslands of England. Darwin noticed the Patagonian hares resembled England's rabbit with its long legs and ears and wondered if it was because they were adapted to the same environment, today known as convergent evolution. His observations of rheas in different latitudes led him to speculate that differences in the longitudes could modify species accordingly. Darwin observed numerous different species of finches on the Galapagos Islands that each had beaks specially adapted to their food choice. Darwin speculated that all finches on the island could have decended from mainland finches, and convergent evolution occurred on the island so that the finches evolved independently.
Joanna Q.
Which observations led Darwin to establish a relationship between extinct and living animals? Select all that apply: Birdwing butterflies were found throughout the Malay archipelago, but species differed slightly from island to island. The fossilized remains of giant sloths were found in places where smaller sloths now live. Tortoises from different Galapagos islands have distinct shells. Bird families clustered geographically: cockatoos in the Malay Archipelago and Australia, macaws and hummingbirds in the Americas. The bony shells of armadillos resembled the shells of ancient Glyptodon fossils. Mockingbirds from different Galapagos islands had subtle, consistent differences.
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