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| to tell the history of development |
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| to point out similarities |
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| to discuss the differences |
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| to give brief a description of the main points |
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| to summarize and evaluate |
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| to separate into parts or baskic principles |
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| to judge the merits and faults of |
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| Human activity activity has completely altered, distrubed, or degraded __% of the earth's land surface. |
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| Presently, the earth is experiencing its ____ great mass___ event, caused by ____ activity. |
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| sixth, extinction, human activity |
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| What percent of the animal and plant species in the us are vulnerable topremature extinction? |
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| Over __ % of the original wetlands have been destroyed by human activity (in the US) |
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| How many speciesare there on earth? |
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| How many species on earth have been identified? |
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| Major causes of species extinction are... |
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Habitat distruction
Introduction of non native species
Climate change
Illegal hunting
Air, soil, and water pollution |
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| What three levels can extinction take place on? |
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Definition
Local
Ecological
Biological |
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| Local extinction means .. |
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| A species is exinc in an area, but not world wide |
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| Ecological extinction means... |
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| A specie's number have been reduced to the extent where they no longer play an ecological role |
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| All members of the species are gone worldwide |
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| five catagories for scarcity classification |
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| common, rare, threatned, endagered, extinct |
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