Which one feature is common to Amphioxus, frog, sea horse and crocodil – McqOptions

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1.	Which one feature is common to Amphioxus, frog, sea horse and crocodile [AIEEE 2003]
A.	Pharyngeal gill slits, at least in the developmental stages
B.	A three-chambered heart
C.	Dorsal solid nerve chord
D.	Skeleton formed of cartilage and bones
Answer» B. A three-chambered heart

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