Select the correct difference between Chondrichthyes and Osteichthyes.
Chondrichthyes Osteichthyes
1. Operculum is present Operculum is absent
2. Air bladder is present Air bladder is absent
3. Ammonotelic Ureotelic
4. Mouth is ventral Mouth is terminal

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answer is D.

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Detailed Solution

The mouth is ventral in Chondrichthyes. The mouth is mostly terminal in Osteichthyes.

Operculum and air bladder are present in Osteichthyes (absent in Chondrichthyes).

Chondrichthyes are ureotelic. Osteichthyes usually excrete ammonia or TMAO (trimethylamine oxide).

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