In steps 4 and 5, you are shown the offspring first. here, you will use a punnett square to determine a.) actual results of a cross between offspring. b.) the actual age of the offspring. c.) the genotypes of the parents. < d.) how genes are expressed.

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.