For a span of some 300 million years,the Paleozoic Era,in which vascular plants,fishes,and other diverse life appeared,lasted approximately ___ of the geologic timescale.

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The Paleozoic Era lasted from about 541 to 252 million years ago, which is roughly 289 million years. Considering the Earth is about 4.6 billion years old, the Paleozoic Era accounts for approximately 7% of the geologic timescale.

For a Span of Some 300 Million Years,the Paleozoic Era,in