2. A scientist is studying the fossils of giraffes from different regions and different time periods. What
would the scientist be most likely to learn about?
A. How the color of giraffes changed over time.
B. How the spots on giraffes changed over time.
C. How the height of giraffes changed over time.
D. How the behavior of giraffes changed over time.

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.