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

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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