关于Caused的知识百科

• What Has Caused the Population Explosion?

• Themainreasonisnotsomuchariseinbirthratesasafallindeathratesasaresultofimprovementsinpublichealthservicesandmedicalcare.Manymorebabiesnowsurviveinfancy,growupandbecomeparents,andmanymoreadultsarelivingintooldagesothatpopulationsarebeingaddedtoatbothe...
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