A) chordates
B) chordates including fishes
C) non-chordates like annelids and orthropods, and vertebrates
D) Mollusca and other vertebrates like man
Correct Answer: D
Solution :
Myogenic heart is found in Molluscs and vertebrates. In this type of heart the initiation takes place by specalised muscle fibres, i.e., self-excitation takes place in fibre group centre called S-A nods.
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