<Ul> <Li> Tlatilco and Tlapacoya, major centers of the Tlatilco culture in the Valley of Mexico, where artifacts include hollow baby - face motif figurines and Olmec designs on ceramics . </Li> <Li> Chalcatzingo, in the Valley of Morelos, which features Olmec - style reliefs on monuments and exposed rock . </Li> <Li> Teopantecuanitlan, in Guerrero, which also features Olmec - style reliefs as well as city plans with distinctive Olmec features . </Li> <Li> San José Mogote, in Oaxaca, which features Olmec - style pottery . San Jose Mogote is, like the larger Olmec site of La Venta, oriented 8 ° west of north . </Li> </Ul> <Li> Tlatilco and Tlapacoya, major centers of the Tlatilco culture in the Valley of Mexico, where artifacts include hollow baby - face motif figurines and Olmec designs on ceramics . </Li> <Li> Chalcatzingo, in the Valley of Morelos, which features Olmec - style reliefs on monuments and exposed rock . </Li> <Li> Teopantecuanitlan, in Guerrero, which also features Olmec - style reliefs as well as city plans with distinctive Olmec features . </Li>

A two-way flow of culture where cultural exchanges are equal between cultures is known as what