I want to know the answer to the following question:
What event produced further adaptations during  the Jurassic and Cretaceous periods?
All the background I'm provided with is that "By the end of the Cretaceous, angiosperms dominated tree floras in many areas, although some evidence suggests that biomass was still dominated by cycad and ferns until after the Cretaceous–Paleogene extinction.". Is that enough to answer the question?