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Question: not sure what the correct answer is and an explanation...

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12. What is the probable sequence in which the following clades of animals originated, from earliest to most recent? i. Chondrichthyes ii. Vertebrata iii. Deuterostomia iv. Cephalochordata v. Bilaterians a. 5→3→2→4→1 (6) 5-5-4-2-1 d. 3→5→4→2→1 e. 3-5 21 4

Not sure what the correct answer is and an explanation to go along with it would be very nice! Thank you!

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