If earth's long history is represented as a single calendar year, the precambrian would end in the , the paleozoic would end in the , and humans would show up in the .

The precambrian period is the longest period in terms of earth's formation and development of several species. The paleozoic (belongs to the cambrian period) is a continuation of the previous era with other species that devedloped in the seas. Human evolution is actually short and brief in terms of prehistoric geological registry, as humans appeared much more towards the end in earth's prehistoric registry (the end of the cenozoic).

If earth's long history is represented as a single calendar year, the precambrian would end in the ____________ , the paleozoic would end in the ____________ , and humans would show up in the ____________ .

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If earth's long history is represented as a single calendar year, the precambrian would end in the , the paleozoic would end in the , and humans would show up in the .