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UNIT 1A ­ The Living World
Ecosystems:
An ecosystem is a community of living organisms (plants and animals) sharing an environment. The largest
ecosystems are called biomes.
A decomposer is an organism that gets its energy by breaking down dead material. Bacteria and fungi are decomposers.
A change to one…

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rainfall.




Hot, Dry Climates have Hot Deserts




Plant adaptations:
· Roots are either very long to reach water or spread
out to catch as much water as possible when it
rains.
· Cacti have swollen stems to store water. Thick,
waxy skin to reduce water loss.
· Cacti and some…

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CASE STUDY ­ TROPICAL RAINFOREST-
DEFORESTATION
There are five main causes for deforestation:
Farming
· Cleared for subsistence farms or commercial cattle ranches.
· Vegetation is cut down and left to dry so it can be burnt ("slash and burn" technique)
Commercial logging
· To make money.
Population pressure
·…

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to make logging companies replant trees when
they cut down trees.
Reducing Demand for Hardwood · There is a high demand of hardwood from
consumers like Mahogany.
· This suggests that hardwood is becoming rare to
find as people are chopping them down.
· Strategies to reduce the demand for…

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However, sustainable management strategies are being used such as:
Deforested areas are being replanted.
Some companies are reducing the amount of hardwood trees felled.
Ecotourism is being popular (E.G. ­ Madre de Dios region, Peru)
Most countries have environmental laws.
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CASE STUDY ­ HOT DESERTS 2
Kalahari Desert: Botswana,…

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