FIVE FACTS & THREE INFERENCES
DARWIN'S EVOLUTIONARY ARGUMENT 1859
Fact 1:Potential exponential population increase
Fact 2: But populations in steady-state
Fact 3: Resources limited, esp. food, space, mates
Inference 1: Struggle for existence among individuals of the population
Fact 4: Uniqueness of individuals within population
Fact 5: Most parental variation inherited in offspring
Inference 2: Differential survival and reproduction = NATURAL SELECTION
Inference 3: Continued over many generations = DESCENT WITH MODIFICATION (i.e., evolution)
(From Ernst Mayr 1977 after Julian Huxley 1942)
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