6.1 Darwin's Theory Notes (What did Darwin find in the Galapagos…
6.1 Darwin's Theory Notes
What did Darwin find in the Galapagos Islands
Darwin found many unusual creatures, including iguanas, giant tortoises, and finches.
He noticed that the animals were slightly different on each island
Ex. The finches on each island had differently sized and/or shaped beaks.
-Finches that ate insects had narrow beaks.
-Finches that ate seeds had wide beaks.
Who was Darwin
Studied Plants and animals all over the world.
Charles Darwin was an Englishman who lived in the early 1800's.
He developed the theory of evolution
How did Darwin's findings influence his theory?
Darwin reasoned that all of the finches cane from the mainland close to the island, so they were all in some way related.
He concluded that the finches had changed over time to develop the different beaks that he saw.
He hypothesized that these changes over time could have been responsible for all of the diffrenet plants and animals that are in the world today.
How did Darwin explain his hypothesis?
Charles Darwin wrote a book entitled The Origin if Species, that described his hypothesis.
He proposed that all the species on earth could have evolved through a process called natural selection
What is natural selection
Definition: The idea that individuals that are better adapted to their environment are more likely to survive and reproduce than other member of the same species.
Darwin identified three factors that affect natural selection.
1) Overproduction - many species produce far more offspring than survive (ie: sea turtles)
2) Variation - members of the same species can have different traits.
3) Competition - food and resources are limited, so the members of a species compete to get the resources they need.
How did Darwin believe natural selection worked?
Darwin believed that organisms with traits that helped them to survive would live and reproduce, while organisms with 'bad' traits would eventually die out.
He proposed that, over a long period of time, natural selection could lead to changes that would result in a whole new species.
Biblical Creationism vs. Evolution
Biblical creationism is the belief that the physical universe, including the earth and all living things, was created by God. This belief is not a part of science because science is based on observation, and no human observed Creation. Creation must be accepted by faith.