(answer asap! need to get test ) believed to be one of the native american groups that established on of the earliest civilizations in the new world. it believed to have been established between 1200 and 400 bc along the gulf coast of mexico. were mound builders. they used a calendar and invented an early form of writing. they worshiped nature spirits and carved jade sculptures of jaguars and serpents.(which best fits this description? ) a: aztec b: olmec c: inca d: mayan