During development mammalian heart is initially two chambered, than three chambered and finally four chambered. It is explained by

Biogenetic law

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Hardy - Weinberg law

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Mendelian

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Lamarckism

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Solution

The correct option is A Biogenetic law
Bio-genetic law is a hypothesis of improvement much debate in science: a creature goes through progressive stages looking like the arrangement of genealogical kinds from which it has plunged so the ontogeny of the individual is a humanization of the phylogeny of the gathering.
So, the correct option is 'Biogenetic law'.

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