Transcript 4.6_presentation

Which statement is the best example of
evolution through Natural Selection?
A Brown Trout die from acid rain in a lake
B Berral cactus grow larger after a heavy rain
C Salmonella bacteria become resistant to
antibiotics
D Swallowtail butterflies are extinct due to
habitat destruction
Read the following questions carefully and answer to
the best of your ability in COMPLETE SENTENCES!!
How does competition between organisms affect
evolution and why must there be competition?
What is an example of natural selection in a species?
What traits have helped this species survive?
How does artificial selection differ from natural
selection?
Natural Selection
• a natural process resulting in the evolution of
organisms best adapted to the environment
• Adaptations – when an animal’s traits become
better suited to its habitat.
• Camouflage is an adaptation that helps animals
blend into their environment
• HUMANS CAN EFFECT NATURAL SELECTION
The Peppered Moth
• Common insects living all over the world
• Their light wings are “peppered” with small
dark spots
Its coloration helps it hide from
predators (birds) on natural-colored
birch tree bark
Human effects
• During the Industrial revolution of the mid1800s, pollution increased.
• This made the bark of trees darker
• Scientists starting noticing a new, darker
coloration in peppered moths!
• They adapted to the darker tree stumps!
Read the following questions carefully and answer to the best
of your ability in COMPLETE SENTENCES!!
How does competition between organisms affect evolution
and why must there be competition?
What is an example of natural selection in a species? What
traits have helped this species survive?
How does artificial selection differ from natural selection?