Why did the dinosaurs become extinct O Cycads and other gymnosperms upon which herbivorous dinosaurs fed declined and the

Question

Why did the dinosaurs become extinct O Cycads and other gymnosperms upon which herbivorous dinosaurs fed declined and the dinosaurs were unable to digest the angiosperms that arose in their place 1 02 The changing climate caused the evolution of most dinosaur species into the existing bird mammal and reptile species that exist today 3 The pollen produced by the rise in flowering plants produced allergenic responses in dinosaurs and interfered with their ability to communicate with potential mates 4 Increasing carbon dioxide levels produced climates too hot for the incubation of their eggs 5 A meteorite or comet crashed into the Earth causing smoke and ash that blocked the sun and caused death of the plants that were food for herbivorous dinosaurs

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