What is biogenetic law and define bilateral symmetry, Biology

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What is Biogenetic Law and define Bilateral symmetry?

In brief, ontogeny recapitulates phylogeny. Or, developmental or embryological sequence of an animal repeats the evolutionary history which gave rise to that animal.
In organisms which have a bilaterally symmetric organization there is only one way that axis of symmetry can pass through oral aboral axis and create two identical halves.


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