How many chambered heart has each of the phylum have:
Annelida
Arthopoda
Aves
Mammalia
Pisces
Molluscs
Vertebrata
Nematoda
Protochordata
Echinodermata

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Solution

Annelida Heart appear first time in annelids
Arthopoda Heart - A dorsal, tubular pulsatile, one to many chambered tubular structure.
Aves 3
Mammalia 4
Pisces 2
Molluscs
Vertebrata
Nematoda
Protochordata
Echinodermata

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