Darwin's four postulates.

Ana Paula Ruiz

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There are a lot of variation inside species and different characteristics per each species.

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The species normally inherence the characteristics of their parents.
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Differential Survival:

Different places where animals live in environments that they are not used to. He made an experiment.
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Some animals don't survive forever and do not reproduce so they start to die.
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Darwin's Four Postulates. berkeley. Retrieved 4 April 2016, from http://ib.berkeley.edu/courses/ib162/Week1.htm

Ch1. Adaptation by Natural Selection. norton. Retrieved 4 April 2016, from http://www.wwnorton.com/college/anthro/bioanth/ch1/chap1.htm

Ch 3. Darwinian Natural Selection. Faculty Buffalo State. Retrieved 4 April 2016, from http://faculty.buffalostate.edu/penaloj/bio405/outline3.html

Hoang, L. (2012). Darwin’s Theory of Evolution. Science 4 All. Retrieved 4 April 2016, from http://www.science4all.org/article/darwins-theory-of-evolution/