About 450 Million Years Ago, the Terrestrial Landscape on Earth

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

A) flowers, grasses, shrubs, and trees
B) completely bare rock, with little pools that contained cyanobacteria and protists
C) tall forests in swamps
D) nonvascular, green plants similar to liverworts forming green mats on rock

Correct Answer:

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