What three traits are used to classify organisms? A
Cell type, how they create energy, number of cells they have
B
Cell type, if they're living or dead, the number of organs they have
с
How they create energy, how many years they live, how big they are
D
The number of cells they have, the number of years they live, the number of
offspring they produce

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.