Where did the earliest indigenous peoples come from, and how did they get to Mesoamerica? What were some similarities and differences between early Mesoamericans and Eurasians?

Ancient Mesoamerica Writing
Write a 1-2 paragraph summary for each of these subjects: #1: Where did the earliest indigenous peoples come from, and how did they get to Mesoamerica? What were some similarities and differences between early Mesoamericans and Eurasians? #2: What is the mystery of corn? How does this relate to early Mesoamerican peoples? #3: What are the effects of corn cultivation on ancient societies? Include social, material, and religious effects. #4: What are some of the hallmark characteristics of the Olmec culture? Discuss four different aspects.