Drag the tiles to the correct boxes to complete the pairs.
Match the stages to their features.
low birth rates, death rates are constant
high birth rate and death rate
high birth rate and low death rate

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.