Most flatworms, including parasitic liver flukes, are hermaphrodites where zygotes form as the result of

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Most flatworms, including parasitic liver flukes, are hermaphrodites, which means they have both male and female reproductive organs. Zygotes form as the result of internal fertilization, where sperm from one individual fertilizes eggs from the same or another individual within the body. Therefore, the best choice is A, internal fertilization. Choices B, C, D, and E are not applicable to flatworms as they do not undergo external fertilization, parthenogenesis, or have mixed eggs and sperm in feces or wastewater.

Most Flatworms, Including Parasitic Liver Flukes, Are Hermaphrodites Where Zygotes