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Chapter 15 delves into Darwin’s revolutionary Theory of Evolution, emphasizing the concept of "change over time." It describes how Darwin, through his observations during the Voyage of the Beagle, gathered evidence suggesting that modern organisms have evolved from ancient ones. His notes on the adaptation of plants and animals to their environments, alongside his findings in the Galapagos Islands—including unique tortoise shell shapes and diverse finch beaks—highlight the intricate relationship between species and their habitats, ultimately shaping our understanding of natural selection.
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Chapter 15 Darwin’s Theory of Evolution
Evolution “Change over time” Process by which modern organisms have descended from ancient organisms
Charles Darwin Made observations and collected evidence that led him to hypothesize about the way life changed over time
Darwin’s Adventures • Darwin saw plants/animals and took notes • Noted how well they were suited to their specific environment • Had visited similar environments but did not see same species (Example: Argentina and Australia) • Collected Fossils
Galapagos Islands • Close together, but different islands • Smallest were hot dry and barren • Largest greater rainfall
Shape of Shells • Tortoises • Shell shape could determine which island the tortoises inhabited
Birds of Galapagos • Finches • Collected finches and studied their beaks
Which finches could “spear” an insect? Which finches could crack big seeds? Which finches could pry seeds from cactus?
