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Darwin’s Theory of Evolution
Spring 2017
Bellringer Video
Darwin and Evolution
• Evolution- the process of change over time
• Darwin’s travels:
• HMS Beagle
• Began in 1831
• Made 3 important observations
Darwin and Evolution
1. The world includes a tremendous diversity of living
things throughout a wide range of habitats
2. Animal species like those in the Galapagos Islands
are
1. Related
2. Can have different characteristics
3. Occupy different habitats in the same area
3. Fossils- preserved remains of ancient organisms,
resembled many organisms today.
Darwin and Evolution
• Darwin’s observations led him to develop the
scientific theory of evolution.
• It explains how modern organisms evolved over long
periods of time by natural selection.
• Adaptation- a trait that helps an organism survive and
reproduce.
Darwin and Evolution
•Natural Selection•Individuals are better adapted to their
environment
•Are more likely to survive and reproduce
more than other members of the same
species.
Darwin and Evolution
•Factors that affect the process of natural
selection:
• Overproduction- species produce more offspring
than can survive.
• Examples: insects and fish
• Variations- difference between individuals
• Competition- resources are limited, but the
species must compete to survive.
!!Bacterial Resistance!!