Answer:
Number of large-seeded grasses in Tigris and Euphrates:
- Obtained through Geographical Luck
- Contributed to the increase of population in that area.
Explanation:
- Obtained through Geographical Luck
The area surrounding Tigris and Euphrates contained soil with high-quality nutrient and close proximity to water sources. This made it very easy for large-seeded grasses such as wheat and rice to grow.
- Contributed to the increase of population in that area.
Those large seeded-grasses tend to really easy to maintain and contain large calories that can be used to sustain a lot of people. This made the people who lived in those area managed to obtained enough food even during harsh climate. This make their survival rate became high and led to an increase in population.
