What did darwin observe about finches in the gal�pagos islands?
a. their feathers were adapted to match their environment.
b. their beaks were adaptations related to the foods the finches ate.
c. they had homologous body structures with other flying vertebrates.
d. they were unrelated to mainland bird species.

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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.