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I I will follow if you answer this questions sure sure sure please answer it properly if not I will report
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Answer: 24- C •renal portal system is not present in all
•Four chambered ventral heart is present but there are phylums in which two and three chambered heart is also present
•Pharyngeal Gill slits are present in in fishes
•Dorsal hollow CNS is a characteristic feature of vertebrates without any exceptions and in vertebrates have a hollow ventral CNS
25 b) both have caudal fin, fin and vertebral column
• chondrichthyes have placoid scales and osteochthyes have ctenoid scales
Note : All these features are given in biology NCERT , please try to read it from further differences
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