Compare/Contrast extra- and intracellular signaling.

Intracellular signaling occurs within a cell, and intercellular signaling occurs between cells. Internal receptors are located inside the cell, and their ligands enter the cell to bind the receptor.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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.