Polar easterlies blow in a curving path from the high-pressure areas of the polar highs to the subpolar lows . What keeps these winds from blowing in a straight line ? A. Mountain ranges
B. Earth revolving around the sun
C. Earth spinning on its axis
D. Doldrums​

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.