The answer to this question is:
A. Barley and wheat were both civilizations' main crops
Happy Studying!!! :)
The 2010 census indicates that since 1960 Mexico’s population has more than tripled to 112.3 million. However, the growth rate between 2000 and 2010 (1.4% per year) is less than half the 3.4% rate of increase experienced in the 1960s. If Mexico’s population had continued to grow at 3.4% since 1960, it would have been over 186 million by now!
<span>the study of the physical features of the earth and its atmosphere, and of human activity as it affects and is affected by these, including the distribution of populations and resources, land use, and industries.
I hope helped ^-^</span>