Discussion
The Palaeozoic era contains ____ time periods.
Answer: A
The Palaeozoic era contains six periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
In North American usage the Carboniferous is split into the Mississippian and Pennsylvanian, which gives seven, but the six-period division is the standard one.
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