Final answer:
Clonorchis requires a snail or fish intermediate host. The parasite's eggs or cysts are ingested by snails and develop into infective larvae, which are then consumed by freshwater fish. Humans become infected with Clonorchis by consuming contaminated fish.
Step-by-step explanation:
Clonorchis requires a snail or fish intermediate host. The life cycle of Clonorchis involves the eggs or cysts of the parasite being ingested by a snail, where they develop into infective larvae. These larvae are then released into the water, where they can be ingested by freshwater fish. Humans become infected with Clonorchis by consuming raw or undercooked contaminated fish.