- During his voyage on the HMS Beagle, he made observations and used them as a basis for his theory of evolution by natural selection. - supported the theory of gradualism and its notion that slow continuous changes shape the earth’s geological features. The theory gave Darwin the idea that the earth’s organisms have also been subject to slow, continuous change.

- the study of the past and present distribution of individual species and entire communities

- found fossils of shells on the cliff tops. Clam fossils of clams and petrified wood were found in the Andes Mountains. Applying the theory of gradualism, Darwin posed the following question: • Did the location of these apparently marine fossils indicate that the cliff once had been submerged in the ocean?

- Darwin found fossils of giant quadrupeds that resembled elephants and hippos. Darwin speculated: • What happened to these animals?

- found fossils of horses throughout South America, a discovery that raised questions related to biogeography. Up to this point, Darwin thought that the Spaniards were the first to bring horses to the Americas

- occurred, and overnight the sea level rose three feet: • If great changes can occur in a relatively short time, couldn’t drastic changes in the environment take place over long periods of time?

The significance of the fossils of shells that Darwin found in the Cape Verde islands was that

- they were found at the top of a cliff

What question did his discovery of horse fossils in South America raise in Darwin’s mind?

- If horses weren’t indigenous to South America, how did the fossils get there?

Many of Charles Darwin’s ideas

- developed during his travels on the HMS Beagle. - developed from his observations of fossilized remains. - were influenced by the ideas of James Hutton and Charles Lyell.

- the study of how organisms are distributed around the planet.

The significance of the quadruped fossils Darwin found while exploring Argentinean riverbeds was that

- they represented species that were extinct

1.3.2 Darwin: The Voyage Continues Flashcards by Irina Soloshenko

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1.3.2 Darwin: The Voyage Continues Flashcards

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