Answer:
Chemical solution in solid form; whose solvent's crystal structure is not altered by solute
Explanation:
The answer is true, catalysts increase rates by lowering the activation energy of a reaction. Catalysts lower the reaction energy and so the reaction occurs faster. Enzymes perform the role of biological catalysts. Most metabolic pathways of the body are controlled by enzymes. Enzymes by classification are proteins. <span />
Dont know the first part but melanin quantities change the dkin color
