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🤯 Did You Know (click to read)
The order Hexanchiformes includes both sixgill and seven-gill shark species.
Sixgill sharks retain primitive characteristics such as six gill slits and a single dorsal fin positioned far back on the body. Most modern shark groups evolved different configurations over millions of years.
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💥 Impact (click to read)
These retained traits are not evolutionary flaws but successful adaptations to deep, low-energy environments where speed is less critical than efficiency and stealth.
The sixgill demonstrates that evolution does not always favor change. In stable extreme habitats, ancient blueprints can outlast more specialized designs.
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