Which of the following structures increase the surface area of the GI tract (ruminant and/or nonruminant)? Nutrition Carbohydrates Proteins Lipids Minerals Vitamins Water Anabolism Catabolism Enzyme Zymogen Phospholipids Autoenzymatic Digestion Alloenzymatic Digestion Monogastric Ruminant Esophagus Storage Mixing Secretion Digestion Absorption