Abiome is best described as a major type of ecosystem with
a) systems of habitats having differing climates
b) different animals having similar niches
c) groups of communities at various successional stages
d) distinctive rainfall temperature and organisms)

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.

if you listed your answers right then i believe your answer is b.