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Competition and . Natural Selection. King Penguins image courtesy of Life in the Fast Lane . Blobfish image courtesy of Biology: A Battle for Survival . Resource Competition. when two or more organisms need the same resource. - PowerPoint PPT Presentation
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Natural Selection
Competition and
Blobfish image courtesy of Biology: A Battle for Survival.
King Penguins image courtesy of Life in the Fast Lane.
Resource Competition• when two or more organisms need the same
resource. – Competition can occur between two different species
or between two individuals of the same species . • The ___________ items include all living
organisms in an ecosystem • The ___________ items include all non-living
materials in an ecosystem • A unique role of an organism within an
ecosystem is known as a — – Niche
biotic
abiotic
Think – Pair- Share
• What are some biotic and abiotic factors that organisms might compete for?
• Why do some organisms end up surviving while others die off?
Natural Selection• Charles Darwin- studied finches (bird species) on the Galapagos islands.
–Natural Selection • (“Survival of the fittest”)
– a natural process resulting in the evolution of organisms best adapted to survive in their environment
image courtesy of MedioAmbiente.net
image courtesy of University of Washington Libraries
.
Traits and Adaptations• Traits- characteristics that can be
passed down from parent to offspring.• Examples: eye color, height,
hunting instincts
• Adaptations- characteristics that help an organism survive better in its environment; inherited OR learned
1. What adaptations does this tree frog have?
2. How is this anteater adapted for survival?
image courtesy of World of Reptiels.
image courtesy of Mammals R Us.
• What factors might these giraffes be in competition for?
• What adaptations do these giraffes have?• Why didn’t the short-necked giraffe disappear
from time period A to B?• How did natural selection change this population
from time period A to C?