Question

Explain the characteristic features of organisms which are cold blooded, three chambered heart and lay eggs

Answer 1

ACCORDING TO THE DESCRIPTION GIVEN HERE WE CAN SAY THAT THE ORGANISM IS NONE OTHER THAN CLASS AMPHIBIA IN PHYLUM CHORDATA OF KINGDOM ANIMALIA. THERE PROMINENT FEATURES ARE AS FOLLOWS-:

1. THESE ARE THE FIRST LAND VERTEBRATES.
2. THEY PASS THEIR EARLY LIFE IN WATER.
3. NO EXOSKELETON PRESENT.
4. MOUTH IS LARGE WITH HOMODONT OR SIMILAR UPPER AND LOWER JAWS, TONGUE CAN BE EXTENDED OUT OF MOUTH OFTEN.
5. RESPIRATION TAKES PLACE THROUGH SKIN OR LUNGS. GILLS ARE PRESENT IN LARVAL STAGE.
6. HEART IS THREE CHAMBERED
7. A TYMPANUM REPRESENTS THE EAR.
8. SEXES ARE SEPARATE. THEY ARE OVIPAROUS.

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