How did egypt's main crops of papyrus and cereals best contribute to the development of the civilization

They had many uses at home and could be traded for other goods.

Explanation:

The ancient Egyptians produced wheat and other cereals, such as emmer, barley, and flax. These were used regularly to bake bread and brewing beer, as well as to craft ropes or fabric. They cultivated papyrus for writing material. Its roots were to be eaten, while the stem was employed to make boats, mats, and paper.

Egyptians used agriculture not only to grow food. They used their crops for medicine, in religious practices, and in the production of clothes, and they would trade the excess for other goods.

would not cooperate with each other voluntarily.

the policy of appeasement influenced the beginning of ww2 because hitler gave the other countrys chocies but after they choose to try and appease hitler to not invade their country but he still invaded them.