Which of the following tends to be more complex in a parasitic helminth than in free-living helminths?

Question

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Parasitic helminths tend to have more complex reproductive systems compared to free-living helminths. This is because reproduction is essential for their survival and transmission to hosts, so they have evolved more specialized and complex mechanisms for reproduction. In contrast, their digestive and nervous systems may be simpler as they do not need to actively seek out food or evade predators.

Which of the Following Tends to Be More Complex in a Parasitic