How do all multicellular organisms begin? a. as complex organisms b. as a single cell c. by expanding the size of their cells d. by creating all their cells at one time
i believe it is b

Speed is the ratio of the distance of an object moves to

Do plant cells perform cellular respiration?

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.