Bacteria. Always have been, always will.
Dinosaurs.
Ammonites are very common fossils from the Jurassic Period. They were dominant in the ocean during and before the Jurassic Period.
Several organisms diversified during the Jurassic period. Crocodiles became larger and more diverse. Dinosaurs and birds diversified and thrived. Of all the organisms in the Jurassic Period, plants diversified the most.
The T-Rex and the Spinosaurus.
During the Jurassic Period, dominant organisms included dinosaurs such as Brachiosaurus, Stegosaurus, and Allosaurus. Other notable organisms included pterosaurs, marine reptiles like ichthyosaurs and plesiosaurs, and early mammals. The flora was dominated by conifers and ferns.
dimetrodon was the dominANT SPECIES OF THE permian period
The dinosaurs were the dominant land animals during the Jurassic and Cretaceous periods, rising to dominance during the late Triassic.
My cousin lenny
dinosaurs
Adam And Eve
a shark and a snail
During the Jurassic, all of the modern continents existed; Europe, Asia, Africa, North and South America, Australia, and Antarctica. Organisms lived on all of these continents.