Where did he go and how did this lead him to develop his theory of evolution? Darwin’s 5 year voyage took him around the world through the Atlantic Ocean around the coast of South America through to the Galapagos Islands and around the coast of Australia, through the Indian Ocean and around the southern tip of Africa, back through the Atlantic Ocean to the British Isles. On his voyage he saw a vast array of diverse organisms, he collected evidence (specimens of living organisms & fossils remains), he made drawings of his observations, he saw the impacts of geologic events (earthquakes and volcanoes) and he read the work of Charles Lyell (a geologist who influenced Darwin concerning the age of the earth). The Galapagos were a major influence he was – fascinated by the unique creatures and how well adapted they were to island life. This voyage helped him appreciate the vast diversity of organisms in the world. The voyage made him question the divine creation of all organisms and the age of the earth. 13. A vestigial is an organ that served a purpose in the distant ancestor of an organism, but is not longer needed in the presently existing, recently evolved, organism. Give an example of a human vestigial organ and explain how it suggests common ancestry. The appendix this narrow, muscular tube attached to the intestine served as a – special area to digest cellulose when the human diet consisted more of plant matter than animals protein. Wisdom teeth early humans had to chew a lot of plants to get enough calories to – survive, making another row of molars helpful Erector pili - are bundles of smooth muscle fibers that animals to puff up their fur for insulation or to intimidate others. Humans retain this ability. They are often called goose bumps. 24. Modern whales resemble extinct land mammals in several characteristics. What does this similarity suggest the evolution of modern whales? They evolved from a mammal that walked on land. 25. What are homologous structures? Give an example. Homologous structures are structures that have different mature in different organisms but develop from the same embryonic tissues. The forelimb of birds, bats, whales, dogs, humans, horses, etc… have the same number and type of bones.
Where did he go and how did this lead him to develop his theory of evolution? Darwin’s 5 year voyage took him around the world through the Atlantic Ocean around the coast of South America through to the Galapagos Islands and around the coast of Australia, through the Indian Ocean and around the southern tip of Africa, back through the Atlantic Ocean to the British Isles. On his voyage he saw a vast array of diverse organisms, he collected evidence (specimens of living organisms & fossils remains), he made drawings of his observations, he saw the impacts of geologic events (earthquakes and volcanoes) and he read the work of Charles Lyell (a geologist who influenced Darwin concerning the age of the earth). The Galapagos were a major influence – he was fascinated by the unique creatures and how well adapted they were to island life. This voyage helped him appreciate the vast diversity of organisms in the world. The voyage made him question the divine creation of all organisms and the age of the earth. 13. A vestigial is an organ that served a purpose in the distant ancestor of an organism, but is not longer needed in the presently existing, recently evolved, organism. Give an example of a human vestigial organ and explain how it suggests common ancestry. The appendix – this narrow, muscular tube attached to the intestine served as a special area to digest cellulose when the human diet consisted more of plant matter than animals protein. Wisdom teeth – early humans had to chew a lot of plants to get enough calories to survive, making another row of molars helpful Erector pili - are bundles of smooth muscle fibers that animals to puff up their fur for insulation or to intimidate others. Humans retain this ability. They are often called goose bumps. 24. Modern whales resemble extinct land mammals in several characteristics. What does this similarity suggest the evolution of modern whales? They evolved from a mammal that walked on land. 25. What are homologous structures? Give an example. Homologous structures are structures that have different mature in different organisms but develop from the same embryonic tissues. The forelimb of birds, bats, whales, dogs, humans, horses, etc… have the same number and type of bones.
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