Which section of the small intestine receives secretions from the liver and the pancreas? a. duodenum b. jejunum c. ileum

Compare and contrast your sells take in oxygen, water, and food. what is one waste product that leaves your cells?

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.

Describe a desert community where there are fewer producers than consumers.