Origin Study Guide 3

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Organismic and Evolutionary Biology
Organismic and Evolutionary Biology OEB 53
Andrew Berry

Julie Vu TF: Pan Pan Jiang THE O RIGIN OF THE SPECIES:C HAPTER 3(S TRUGGLE FOR EXISTENCE ) In thischapter, whatdoes Darwinfixate onasa mainforce ofnatural selection? (wenow know that selectioncanwork inmanyways) Darwin emphasizes the “struggle for existence” as the ultimate force behind natural selection, as it is lack of resources, etc. in the natural environment that any potentially beneficial variation will allow an individual to survive and pass on its variation to its offspring. What pointdoesDarwin make whenhetalksabout “checks”? Darwin makes the case that organisms tend to increase at a geometric rate, yet it is clear that for each species, there are
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