Under Europe's feudal system, lords a. worked along side peasants in the fields.
b. sat at the top of the Great Chain of Being.
c. practiced Islam.
d. Protected serfs in exchange for crops.

D

Explanation:Europe actually did exchange for crops from different countries

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.