About 450 million years ago, the terrestrial landscape on Earth would most likely have had which of the following features?

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About 450 million years ago, during the Ordovician and Silurian periods, the terrestrial landscape was beginning to be colonized by life forms, but it was still very early in the history of land plants. The first land plants were nonvascular and simple, similar to modern liverworts, and would have formed green mats on rocks rather than the more complex ecosystems seen in later periods.

About 450 Million Years Ago, the Terrestrial Landscape on Earth