Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate. Parasites, which are smaller than their hosts

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问题 Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate.
Parasites, which are smaller than their hosts, include ______.

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答案many viruses and bacteria

解析 参见小标题3.Parasitism下面第2句:Parasites,which are smaller than their hosts,include many viruses and bacteria.
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