What did glyphs left by the ancient olmec civilization tell us about their religious practices?

That they believed in gods

Explanation:

The Olmec were the first major civilization in Mexico. ... Appearing around 1600 BCE, the Olmec were among the first Mesoamerican complex societies, and their culture influenced many later civilizations, like the Maya. The Olmec are known for the immense stone heads they carved from a volcanic rock called basalt.

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The British colonization of the Gold Coast led to several wars among ethnic groups.