How language change has happened at a diachronic level, also at the acquisition level, because this very famous statement ontogeny recapitulates phylogeny.
Diachronic level पर भाषा बदलाव कैसे हुआ है, किसके साथ साथ acquisition level पर भी, क्योंकि यह बहुत प्रसिद्ध बयान है "ontogeny recapitulates phylogeny"।