Theory and Fact Evo dcs 2016

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Do Now: What is the difference between a S cientific T heory and a Fact ?


Fact fakt / a thing that is indisputably the case. For example, it is a fact that the Earth is round.


What is a SCIENTIFIC THEORY? A scientific theory is a well-supported testable explanation of phenomena… which is a fancy way to say: “It’s the best explanation we have right now.”


Recall from Ecology, that the assortment, or variety, of living things in an ecosystem is called: Biodiversity


How did life on Earth get so diverse?




Is evolution a theory or a fact ?


The Big Bang theory The theory of relativity (E=MC2) The theory of planetary motion The theory of evolution and natural selection Who knows of any theories?


What is Evolution? Evidence indicates that life on Earth began more than 3 billion years ago. Fossils found in ancient rocks have given us many clues to the kind of life that existed long ago. The first living organisms were simple, single-celled organisms. Over time, more complex single-celled creatures developed. Then, about a billion years ago, increasingly complex, multicellular organisms began to appear. This is the idea! The explanation of why species are so different and how they survive through a changing environment. Mutations and nature selecting the most fit are the two potent forces resulting in this product. This product is called….. EVOLUTION Blah blah blah blah … Is Mr. Scalisi still talking?


A species is a group of organisms that can reproduce and have fertile offspring. Evolution the mechanism by which different kinds of living organisms are thought to have developed from earlier forms during the history of the earth.


The “father” of Evolution is Charles Darwin. He’s on the 10 pound bill in England, so he’s kind of a big deal.

Darwin’s theory of evolution:

Darwin’s theory of evolution Charles Darwin was influenced by previous scientists theories and came up with a better theory. Darwin proposed that evolution took place through natural and sexual selection . Darwin developed his theory of evolution after noticing similarities between fossils and the adaptations of modern day animals he saw during his round-the-world voyage on the HMS Beagle (his ship)

Darwin was influenced by.:

The short-necked ancestors of modern giraffes needed to reach the leaves on tall trees when food was scarce. Darwin was influenced by. How would this theory explain a giraffe’s long neck? Over their lifetimes these giraffes stretched their necks; a trait which was then passed on to their offspring. Jean-Baptiste Lamarck was a French botanist who believed that species evolved because they inherited traits acquired through the over or under-use of body parts.


Jean-Baptiste Lamarck

Controversial research:

Darwin knew that in his religious society his findings would be controversial. He was unwilling risk his life and publish his findings. However, 20 years later, Darwin learned that Alfred Russel Wallace had proposed an almost identical theory of natural selection, and published his findings. Controversial research

Darwin published his book in 1859:

Darwin published his book in 1859 Even though he was afraid of the Church’s reaction to his book he wanted to get credit. Known as ”The book that changed the world ,” The Origin of Species , was instant bestseller and drew both applause and fury.

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