They must be collected at the same rate across the country
Explanation:
Islamic mathematicians such as Al-Khwarizmi, Avicenna and Jamshīd al-Kāshī made advances in algebra, trigonometry, geometry and Arabic numerals. Islamic doctors described diseases like smallpox and measles, and challenged classical Greek medical theory.
The aspect of the communist approach that was responsible for Mao's victory is using the "Guerrilla's Tactics" and these tactics are the following:
1. They will retreat when the enemy advances.
2. They harass when enemy encamps.
3. They will attack every time the enemy is hesitating.
4. They will pursue when the enemy is retreating.
It was challenging because there wasn't many tools then and not a lot of relying resources. As early New England was developing, some crops would die off from livestock eating it, and lack of knowledge of what they were farming. This was some major things in the development of new England's agriculture.
I think wheat,but im not for sure you might want to get some one else to answer it tho im so sorry.