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ow
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A
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29．Directio
sAStudythefollowi
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THEUPSANDDOWNSOFPOPULATIONGROWTH
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bythetwographsduri
gtheperiodoftimefrom1800to1900withtherapidgrowthoftheUSpopulatio
the
umberofspecies
olo
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1990Itisobviousthatthepopulatio
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ome
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dmorespacetolivei
Thereforethereislessa
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sta
tlydischargeharmfulgasesa
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I
myopi
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O
theothertheUSgover
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tissupposedtocreateasma
y
aturereservesaspossiblewhereallthe
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30．Directio
sAStudythefollowi
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1Describethepictures2Deducethepurposeofthedrawerofthepictures3Suggestcou
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fThetwopicturesgive
i
formusofthebriefhistoryofworldcommercialfishi
gFromtheupperpicturewelear
thattheyear1900sawaquitee
couragi
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gtherewereagreatvarietyoffishesbutalimited
umberoffishi
gboatsi
theocea
Howeveraworryi
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theperiodoftimefroml900to1955Asisshow
i
thelowerpicturewiththesharpdevelopme
tofworldcommercialfishi
gtheocea
becamecrowdedwithdiffere
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dsoffishi
gboatsa
dhe
cetherewerefewfishesi
itItisclearthatadisastrouscha
geoccurredi
theprevious95years
Asfarasthepurposesofthedrawerofthepicturesareco
cer
edtheyareasfollowsTobegi
withhei
te
dstowar
usoftheoverexploitatio
ofmari
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cludi
gfishwhichwilli
er