Explanation:
the most complex energy system is the aerobic or oxygen energy system which provide mass of the body's ATP
First, it was a very cool climate in the early fourteenth century when the crop failure happened. Also, irregular lengthy rain patterns killed the crops very fast.
Social classes: King
Priests
Scribes
Merchants & Artisans
Commoners
Slaves
Economic classes: calendar and irrigations (via canals and ditches), craftsmen (copper and bronze workers)
Europeans viewed the spread of Islam as a threat and actively worked to stop it.
Answer:
A major goal of Henry Clay's American System was to promote industry through improving transportation. This included major support of the development of road's and canals.
