Download Unit 3: Evolution, Biodiversity, Climate, Weather, and Biomes

 Rainforests are the most diverse biomes in the
world.
 Is preserving this biodiversity important?
 Why or why not?
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4.2.2 – Discuss the perceived vulnerability of
tropical rainforests and their relative value in
contributing to global biodiversity
4.2.3 – Discuss current estimates of numbers
of species and past and present rates of
species extinction
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28% of world’s oxygen turnover (CO2 →O2)
Huge amount of biodiversity
 40-75% of all species
 Large numbers of species endemic to area
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Video 3
Video 4
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Video
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Most species have evolved to inhabit very specialized
niches in their environment
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When humans disrupt that environment, many species
cannot survive
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Humans have destroyed/disturbed about half of these
forests
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Because species depend on each other in a
complicated web of relationships, changing just one
part of the web harms the entire ecosystem
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This breakdown of rainforest ecosystems will likely
lead to the disappearance of up to 10% of the world’s
species within the next 25 years
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Humans depend on the rainforest’s millions of
life forms for its own existence
 The genetic diversity provides invaluable additions
to the gene pool which help maintain and improve
domestic crops
 Without a diversity of strains, crops become overly
homogenous and vulnerable
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The projected major harmful effects:
 Reduce Earth’s vital biodiversity
▪ Destroying/degrading the habitats of unique organisms
 Accelerate climate change due to global warming
▪ Reduction of CO2 consumption
 Alter regional climate patterns to prevent return of
diverse forests in cleared lands
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Design an experiment where you investigate
the effects of some factor on the biodiversity
at a site of your choosing
You will be assessed on all 3 aspects of the
Planning rubric