Based on the descriptions of the artifacts and the civilizations in question, the response that most accurately captures the key features of the Olmec, Zapotec, and Chavin civilizations is:
cosmo-magical belief system centered on worshipping mythical creatures, and artifacts with human, avian, and feline features.
This response aligns well with the descriptions of the artifacts, such as the stone sculpture with an avian head and aspects of the cultures which emphasized a connection to the mythical, often blending human and animal features in their representations.