How did grass originate?

Answer 1

There was no grass until 23 million years ago in the Neogene period (part of the Cenozoic period). In this same time period there was the development of flowering plants. Some scientists think this harder to eat and digest plant species was in part the cause of the downfall of grazing dinosaurs and the rise of grazing mammals. Grass originated as an evolution from earlier plants in response to environmental pressures.