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

Herfacedoesn’t______muchovertheyears.

Theeditorofanationalweeklynewsmagazineisgladtohearthatthe______ofhismagazinehasriseninthepasttenyears.

Thelocalpeoplewereannoyedtofindthepriceofvegetables__________accordingtotheweather.

The______thedoctorfacedwaswhetherheshouldtellthepatientthetruth.

Asoureyesrangedoverthebroadshouldersofthemountain,theconceptionofits______grewuponus.

Methodsofcontrollingexpensesareamere_________ofthelevelsoftrustinanorganization.

Manyrarespeciesofplantsandanimalsarethreatenedwith______withtheworseningofenvironmentandmasshunting.

Dr.Johnson______thetaskofwritingacomprehensiveEnglishdictionary.

Corporationsasagroupofferavarietyofjobs.Mostlargecompaniessendpeopletocollegesto【36】graduatingstudentswiththe

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