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6.Evolution
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Gill clefts and notochord appear in the embryonic development of all vertebrates from fishes to mammals. This supports the theory of
A
Recapitulation
B
Metamorphosis
C
Biogenesis
D
Abiogenesis
Solution
'Ontogeny repeats or recapitulates phylogeny’ is given by Ernest Haeckel
Standard 12
Biology
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