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Answer: 4. Ectoparasite

Key idea: Cyclostomes (lamprey, hagfish) are jawless vertebrates.

All living members are ectoparasites on fishes. They suck blood with a circular sucking mouth and rasping tongue. They are not endoparasites, symbiotic, or truly free living. Answer: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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