Maya or Mayans as most people call them.
Zapotec
100% sure it was the Zapotec. Not the Maya.
The group of a scientist first began to develop biological concepts.
Some places were still switching from the Julian Calendar during the 20th century, but the first group of countries to switch to the Gregorian Calendar did so on October 15, 1582.
exists in all animals.
I believe the Azctecs, the Mayans and the Incans all worship the Jaguar.
No, not they we know of. The Olmec were a mesoamerican civilization that developed well before the mayans developed. At the time of the height of the Olmec civilization, the mayans were still a relatively primitive group of tribes. They may have interacted, and the Olmec might have taken advantage of them, but the Classical Maya (those with pyramids, hieroglyphs, and calendar), had no interasction with the olmec.
The Mayan's
See: Julian calendar
I don't know what Teotihuacan is, but I do know that Tenochtitlan was the capitol of a group Mesoamerican Indians that is now Mexico City, the capitol of Mexico.
the person who formed a group to revise the Roman calender was Julian Ceaser
The Celts were an Indo-European group known to have based their calendar on the phases of the moon. Their calendar consisted of lunar months and tracked time by observing the moon's cycles.