How do you lose weight? a. by using up less energy than you take in b. by using up less calories than you take in c. by using up more calories than you take in d. by using up more money on diet programs and pills?

Is there any solid scientific evidence that humans have been cloned?

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.

Injuries in the environment are a result of