Final answer:
Life in the Valle of Oaxaca prior to cultivation was not characterized by the absence of large animal species and the exclusive involvement of women in breeding new staple crops.
Step-by-step explanation:
Prior to cultivation in the Valley of Oaxaca, there were several aspects of life that were not true. Firstly, it is not true that there were no large animal species in the Americas for the natives to domesticate. This absence of large grazing animals like cows or sheep affected the farming practices in the region. Additionally, it is not significant that the people breeding new staple crops in the Americas were mostly women. Although women played a crucial role in agriculture and the development of new crops, men were also involved in these activities.