Question

Choose the correct statements :
I. Cartilaginous fish swims continously due to the presence of an air bladder.
II. Osteichthyes have four pairs of gills that are covered by an operculum.
III. The notochord is persistent throughout life in Chondrichthyes.
IV. Teeth of cartilaginous fishes are modified placoid scales.

Answer 1

Answer:

1. true

2. true

3. true

4. true

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