Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate

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

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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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