(D) The giant reptiles (dinosaurs) became extinct during the $Cretaceous$ period.This mass extinction was primarily caused by a combination of factors

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(D) The giant reptiles (dinosaurs) became extinct during the $Cretaceous$ period.This mass extinction was primarily caused by a combination of factors including a lack of adaptability to changing environmental conditions,a depleted supply of food,increased predation,and large-scale destruction of their eggs.