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Write the general characters of the clas...

Write the general characters of the class chondrichthyes.

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1. They are cartilaginous marine fishes.
2. Notochord is persistent throughout life.
3. The skin is covered by dermal placoid scales.
4. Caudal fin is heterocercal.
5. Jaws are powerful.
6. Respiration is by lamelliform gills without operculum
7. Mesonephric kidneys are present.
8. They have two chambered heart.
9. They are ureotelic.
10. They are poikilothermic and viviparous.
11. Sexes are separate and fertilization is internal. e.g., Scoliodon.
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