Which molecules are involved in protein synthesis?

a) transfer rna, introns, and mutagens
b) messenger rna, introns, and ribosomal rna
c) ribosomal rna, transfer rna, and mutagens
d) messenger rna, ribosomal rna and transfer rna

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.