Why would a civilization choose to live near a river that regularly floods?
A. The presence of alluvium in the flood plain
B. The presence of tributaries in the flood plain
O
C. The presence of a higher bed load
O
D. The presence of a higher suspended load

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit. there is a precise compatibility between the active site and the lactose molecule. specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed. reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.