In order to digest milk, the human body must manufacture a protein called lactose. when the digestive system requires lactase, it manufactures the protein based on information store in what molecule

DNA (where all genetic information and instructions on how to build proteins is stored)

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.