El Paleozoico se divide en seis períodos: Cámbrico (la vida animal florece en los mares), Ordovícico (dominan los invertebrados), Silúrico (primer animal de respiración aérea), Devónico (aparecen peces con escamas duras y los anfibios), Carbonífero (aparecen grandes bosques de helechos, primeros reptiles etc,
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Many delegates believed that the federal government should be able to overrule state laws, but others feared that a strong federal government would oppress their citizens. The delegates compromised by allotting specific responsibilities to the federal government while delegating all other functions to the states.
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