What other flora and fauna lived during the same time as a t-rex?

During the late Cretaceous period, when the T. rex roamed the Earth, a diverse array of flora and fauna existed. This included other dinosaurs like Triceratops and Velociraptor, as well as large marine reptiles like mosasaurs and plesiOSaurs. The landscape was dominated by coniferous trees, cycads, and flowering plants (angiOSperms), which provided habitat and food for various herbivorous dinosaurs. Additionally, small mammals, birds, and numerous invertebrates thrived in this rich ecosystem.