Need with cactus big points
okay so my moon cactus was rotting so i did what google said and cut the head off.
i really love my moon cactus so tell me what i should do next, tips recommendations or what i did wrong needs to be very precise and correct because i want my cactus to turn into another cactus

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.