Essential Question What causes species to evolve over

Essential Question: What causes species to evolve over time? *Use these key-terms: environment, millions of years, adaptation, natural selection, common ancestor, extinction SECTION 5 -1: EVOLUTION Learning Target 22. Provide evidence from several sources that all organisms have evolved from a common ancestor. 23. Explain the four factors that result in the evolution of a species.

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OVERVIEW Charles Darwin was an English

OVERVIEW Darwin traveled to the Galapagos Islands aboard the H. M. S. Beagle.

OVERVIEW Book: “The Origin of Species” Darwin publishes his theory 25 years after his voyage on the Beagle.

OVERVIEW Darwin observed the finches. Galapago on _____

OVERVIEW The birds were similar, but they had beaks different

OVERVIEW These finches probably shared a common ancesto. _______ r

OVERVIEW These finches probably shared a common ancestor.

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GALAPAGOS ISLAND Darwin collected fossils. §Some fossils looked like organisms that were still alive. §Others looked completely unlike any creature he had ever seen.

Extinct Glyptodon Size of a VW Beetle car Armadillo Size ofmm a large football

What does this mean? This means that they could have had a mm _______ common ancestor millions of years ago!

GALAPAGOS ISLAND Darwin observed that tortoises from shell ______ different islands had different

GALAPAGO S ISLAND Even though these tortoises are different, how come they have so many similarities?

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EVOLUTION Darwin thought, “Maybe a long time ago the turtles living on different islands all belonged to the same

These different species would have evolved from a common ancestor. EVOLUTION

EVOLUTION These different species would have evolved from a common ancestor.

EVOLUTION Evolution = change over time ****It takes a long time to

EVOLUTION Evolution = change over time ****It takes a long time to

EVOLUTION Hutton and Lyell proposed that geological forces shaped the Earth over Millions of years.

EVOLUTION A change in environment can cause a change in the animals inhabiting the

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NATURAL SELECTION natura selecti Darwin proposed theory of _______

NATURAL SELECTION Galapagos The turtles on _______ Island probably had a ancestor common ______. Then Pangea caused their natural evolution through _____ selection.

NATURAL SELECTION

NATURAL SELECTION There are turtles that have necks that can eat food on low and high ground.

NATURAL SELECTION Turtles with long necks can reach for

NATURAL SELECTION Turtles with short necks only eat food on the