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A Voyage of Discovery
Learning Objectives
▪ Identify Charles Darwin’s contribution to science.
▪ Describe the three patterns of biodiversity noted by
Darwin’s Epic Journey
Observations Aboard the Beagle
Species Vary Globally
Darwin noticed that different, yet ecologically similar, species
inhabited separated, but ecologically similar, habitats around
the globe.
Species Vary Locally
Species Vary Over Time
Ideas That Influenced Darwin
Learning Objectives
▪ Identify the conclusions drawn by Hutton and Lyell about
Earth’s history.
▪ Describe Lamarck’s hypothesis of evolution.
▪ Describe Malthus’s view of population growth.
▪ Explain the role of inherited variation in artificial selection.
An Ancient, Changing Earth
Geologists James Hutton and Charles Lyell concluded that Earth
is ancient and still changing.
Hutton and Geological Change
Lyell’s Principles of Geology
Lamarck’s Evolutionary Hypotheses
Jean-Baptiste Lamarck was
one of the first naturalists to
argue strongly that species
are not fixed.
Population Growth
Thomas Malthus reasoned
that if the human population
grew unchecked, there
wouldn’t be enough living
space and food for
Artificial Selection
Darwin’s Theory: Natural Selection
Learning Objectives
▪ Describe the conditions for natural selection.
▪ Explain what evolutionary theory suggests about the unity
and diversity of life.
Evolution by Natural Selection
The struggle for existence
Variation and adaptation
Survival of the fittest
Natural selection
Natural Selection
Common Ancestry