Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate. Certain insects, such as the monarch butterfl

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问题 Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate.
Certain insects, such as the monarch butterfly, can incorporate poisonous substances found in food plants into their own tissues and use them as ______.

选项

答案a defense against predators

解析参见小标题4．Coevolution下面第6句：Certain insects，such as the monarch butterfly，can incorporate poisonous substances found in food plants into their own tissues and use them as a defense against predators．

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大学英语六级

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Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate. Certain insects, such as the monarch butterfl

大学英语六级

Goodteachershaveadeepunderstandingofthechildren’sneedandenjoyfirm______

Everynewmembershouldpromiseto___________thespiritofcorporationandstrivetorealizeindividualvalue.

Ifsomethingcanbeeasilyseen,wesaythatitis________.

Medicalexpertsbelievethatthehigh______ofheartdiseaseandhighbloodpressureisrelatedtooverabundanceofcholesterol

Anexpensiveprojectlikethisis______withthegovernment’saimofreducingpublicspending.

Theseareasrelyonagricultureutmost______,havingfewmineralresourcesandaminimumofindustrialdevelopment.

Mainstreameconomistsprofessmuchpuzzlementoverthefailureoftherateofproductivitygrowthto______sofarinthisdecade

Elderlypeople,consideredtoo_________todoanythingforthemselvesorothers,arerapidlylearningtobecomeself-sufficient

Attemptstorestrictparkinginthecitycenterhavefurther_________theproblemoftrafficcongestion,andsometimesthetraf

Dr.Johnson______thetaskofwritingacomprehensiveEnglishdictionary.

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