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Transcript
Evolution
7th Grade Life Science
Question:
 How does natural selection lead to
evolution?
Darwin’s Theory of
Evolution 3/9/15
Evolution—the process of change over time
In Darwin’s travels aboard the HMS Beagle, which
began in 1831, Charles Darwin made three important
observations:
 The world includes tremendous diversity of living things
throughout a wide range of habitats
 Animal species, like those in the Galapagos Islands, that
are related, can have different characteristics or occupy
different habitats in the same area.
 Fossils—preserved remains of ancient organisms,
resembled many organisms alive today.
Darwin’s observations led him to develop the
scientific theory of evolution, which explains how
modern organisms evolved over long periods of
time by natural selection.
Adaptation—a trait that helps an organisms survive
and reproduce
Natural selection—process by which individuals that
are better adapted to their environment are more
likely to survive and reproduce than other members
of the same species.
Factors that affect process of natural selection:
 Overproduction—species produce more offspring
than can survive
 Variation—difference between individuals
 Competition—resources are limited, species
must compete to survive
 Theory
 Natural selection
 Adaptation
 Fossils
 Evolution
 Competition