Download Evolution

Adaptation
• a characteristic or
trait that helps an
organism survive
and reproduce in
its environment.
Evolution
• Evolution is the
process by which
populations change
over long periods of
time.
Fossil Record
• The fossil record
shows us some of the
changes that have
occurred over time.
• This fossil of Archaeopteryx is
a link between reptiles and
birds.
• What are its reptilian
characteristics? What are its
bird-like or avian
characteristics?
Charles Darwin
• Served as a naturalist on
a trip to the Galapagos
onboard the Beagle (an
old naval ship).
• This voyage and other
observations, such as the
selective breeding of
dogs, led to his theory of
natural selection.
Natural Selection – the process by
which evolution occurs
• Overproduction – each specie
will have more offspring than
will survive
• Genetic Variation – individuals
within a population have slight
differences
• Struggle for Survival –
individuals within a population
compete for resources (food,
shelter, etc.)
• Successful Reproduction –
those individuals that are best
adapted to environment are
more likely to survive and
reproduce – passing on the
traits that allowed them to
survive