What developments occurred from the jurassic period to the cretaceous period?

Dinosaurs were common in the Jurassic period, but during the Cretaceous period they went extinct. Pangaea had fully split by the Cretaceous period and angiosperms had developed. Hope this answers the question. Have a nice day. Feel free to ask more questions.

Is this a question? i'm confused

You should never redesign your experiment. try and see what in your experiment you made a mistake on or try and test your experimemt with somebody else. see if they get the right results.