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answers
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Define species. ||
a group of organisms that interbreed and produce fertile
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offspring ||
State limitations of using a key to identify organisms.
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- features can change with season/age
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- can be hard to distinguish between species
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- only already discovered species can be identified
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Describe a method to estimate the size of a bird
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population.
- Lincoln Index/capture mark recapture
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- trap birds and mark before releasing
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- recapture a sample after a sufficient time period
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- use Lincoln Index formula to calculate total population
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- suitable for closed population (not migrating)
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,Explain what is meant by natural income.
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the value of natural capital that provides goods or
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services
How can the maximum sustainable yield be calculated?
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- it is the maximum rate that can be exploited without
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depleting the stock || ||
- annual gain in biomass / annual growth of cattle minus
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death
Why may some countries not have switched to recycling?
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- political change away from Green politics
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- economic constraints making it too expensive
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- increase in waste due to increased population
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Evaluate incineration in managing solid waste.
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+ cheap
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+ ash can be used as a raw material
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,+ can kill disease agents
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+ can produce energy
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- residue still requires disposal
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- produces air pollutants like GHGs/CO2
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- linked to cancer/health problems
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- transportation problems
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Why might ecological footprints increase?
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- increased industrialisation increases resource use
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- changes in diet to more meat
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- consumer society uses more resources
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- higher standard of living increases car
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ownership/pollution
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Suggest advantages of using ecological footprints as a
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measure for sustainability. || ||
- simple to use allowing comparisons
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- easy to communicate allowing more people to
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understand their impact || ||
- easily used in marketing so can be easily disseminated
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, - links global and local impact so helps tracking of
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sustainability
What causes an increase in stratospheric ozone
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concentration?
Increased CFCs production || ||
What causes an increase in tropospheric ozone
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concentration?
Increased vehicles/industry that produces hydrocarbons
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or VOCs
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Evaluate the effectiveness of the Montreal Protocol in
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managing ozone depletion. || ||
+ ozone hole has decreased in size
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+ has caused a reduction in CFCs use
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+ referred to as the most successful international
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agreement
+ agreed to by many nations
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+ provides a model for other agreements
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- agreement was not followed by immediate response
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