Oxygen and carbon dioxide pass through the cell membrane by the process of a respiration b osmosis c mitosis

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )

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.

How many chromosomes are in a human gamete?