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Darwin saw …
And concluded that…
Species have changed over time
• … The theory of evolution.
• Time being millions of years
Supported by additional evidence
He then wondered – How?
• To figure it out he
once again observed
nature and saw
• “Variation” are the
differences within a
• Variation is caused by
sexual reproduction
Examples of Variation
• He used how humans were changing dog
traits to figure it out.
• What do you think he concluded?
Theory of Natural Selection
• Process where only the organism best adapted
to their environment survive and reproduce
• Their genes and traits are passed to offspring
• Less adapted individuals do not survive, genes
are eliminated
• Over time, entire population changes to show
traits of the best adapted