Please help me. The test is due soon! What is the term for the movement of heat inside the Earth that causes plate tectonics?
Rising Magma Flow
Mantle Convection
Manipulated Variable
Isostasy

Which of the four major uses is predicted to change the least by 2020?

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

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.