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In general - in thedevelopmental history of amammalian heart - it isobserved that it passes througha two-chambered fish-likeheart - three-chambered froglike heart and finally to fourchambered stage. To whichhypothesis can this abovecited statement beapproximated?

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In general - in thedevelopmental history of amammalian heart - it isobserved that it passes througha two-chambered fish-likeheart - three-chambered froglike heart and finally to fourchambered stage. To whichhypothesis can this abovecited statement beapproximated?






 
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