powerpoint presentation - evolutiondarwin’s theory of evolution evolution, or change over time, is...
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EVOLUTION
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Charles Darwin
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Darwin’s Theory of Evolution
Evolution, or change over time, is the process by which modern organisms have descended from ancient organisms.
A scientific theory is a well-supported testable explanation of phenomena that have occurred in the natural world.
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How do you think Darwin came up with his theory?
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Voyage of Beagle Dates: February 12th, 1831
Captain: Charles Darwin
Ship: H.M.S. Beagle
Destination: Voyage around the world.
Findings: evidence to propose a revolutionary hypothesis about how life changes over time
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Patterns of Diversity Argentina and Australia had similar grassland ecosystems.
◦ those grasslands were inhabited by very different
animals.
◦ neither Argentina nor Australia was home to the sorts of animals that lived in European grasslands.
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Evolution by Natural Selection
Members of each species have to compete for food, shelter, other life necessities
Survival of the Fittest-Some individuals better suited for the environment, they are the ones that survive and reproduce
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Natural Selection Over time, natural selection results in changes in inherited characteristics of a population. These changes increase a species fitness in its environment
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Evidence of Evolution The Fossil Record
Geographic Distribution of Living Things
Homologous Body Structures
Similarities in Early Development
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Evidence for Evolution
The Fossil Record-Layers show change
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Evidence of Evolution Geographic Distribution of Living Things-similar environments have similar types of organisms
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Geographic Distribution of Living Things
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Evidence for Evolution
Vestigial organs-organs that serve no useful function in an organism
i.e.) appendix, miniature legs, arms
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Homologous Structures
Homologous Structures-structures that have different mature forms in different organisms, but develop from the same embryonic tissue
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Similarities in Early Development