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

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

admin2012-11-30  19
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 ______.
选项
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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