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Darwin's Theories.

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Presentation on theme: "Darwin's Theories."— Presentation transcript:

1 Darwin's Theories

2 STRUGGLE FOR EXISTENCE
Darwin’s central theme Based on Malthus’s work on population growth

3 FITNESS A Key factor in the struggle for existence
The result of adaptations Central to natural selection

4 NATURAL SELECTION Only certain individuals produce new individuals
Over time, it will result in changes in the inherited characteristics of a population. These changes increase a species’ fitness in its environment.

5 DESCENT WITH MODIFICATION
Each living species has descended, with changes, from other species over time.

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