Question

This class of fishes are the ancestors to amphibians and the amniotes.

A) Petromyzontida
	B) Sarcopterygii
	C) Actinopterygii
	D) Chondrichthyes

Answer 1

	ANIMAL	CLASSIFICATION	CHARACTERISTIC FEATURES
A	petromyzontida	PHYLUM-CHORDATES SUB PHYLUM-Vertebrata CLASS-Hyperoartia ORDER-Petromyzontiformes	MARINE AS WELL AS FRESH WATER 7 PAIR OF GILL SLITS PRESENT ANADROMOUS 10 PAIR OF CRANIAL NERVES TWO SEMI-CIRCULAR CANALS INDIRECT DEVELOPMENT SEXES ARE SEPARATED BRAIN IS BETTER DEVELOPED
B	sarcopterygii	PHYLUM-CHORDATES SUB PHYLUM-Vertebrata CLASS-OSTEICHTYES SUB CLASS-TETRAPODOMORPHA	THEY ARE LOBE FINNED FISH THEY HAVE LUNGS THEY WERE FAST SWIMMERS THEY HAVE HETROCERCAL TAIL SERCOPETRIGII FISH HAS CENTRAL APPENDAGE IN THEOR FINNES CONTAINING MANY BONE AND MUSCLE THEY HAVE LUNG FOR AERIAL RESPIRATION THE SENSORY ORGAN ARE ADAPTED FOR RECEPTION IN AIR SUCH AS VISION HEARING SMELLING NARES ARE INTERNAL
C	actinopterygii	PHYLUM-CHORDATES SUB PHYLUM-Vertebrata CLASS-OSTEICHTYES SUB CLASS-ACTINOPTERYGII	RAY FINNED-FISH GENRELLY LACK CHOANAE INTERNAL NARES ARE ABSENT SKELETAL USAULLY OSIFIED AIR SAC FUNCTION AS SWIMING BLADER THEY HAVE EXTERNAL GILLS TO INCREASE OXYGEN UPTAKE
D	chondrichthyes	PHYLUM-CHORDATES SUB PHYLUM-Vertebrata SUPPER CLASS- PISCES CLASS- CHONDRICTHYES	THEY ARE MARINE ANIMAL WITH STREAMLINE BODY ENDOSKELETON IS MADE UP OF CARTILAGE NOTOCHORD IS PERSISTENT THROUGHOUT LIFE MOUTH IS LOCATED VENTRALLY WITH PLACOID SCALES JAWS ARE POWERFUL ,KIDNEY ARE MESONEPHRIC HEART IS TWO CHAMBER AIR BLADDER ABSENT THEY ARE COD BLOODED ANIMAL SEXES ARE SEPERATED FERTILIZATION IS INTERNAL AND MANY OF THEM ARE VIVIPAROUS THEY HAVE 10 PAIR OF CRANIAL NERVES

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