Why is it so important to mankind that nasa finds life on mars?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

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.

All phases of matter may have a fixed mass