Inner planets have thicker atmospheres.
Species richness increases as we travel southward from the North Pole.
Explanation:
Species richness is at its highest in places near or surrounding the equator and reduces gradually towards the poles. As one travel towards south from the northern pole, the temperate, tropical and equatorial regions will be reached where there is huge diversity of species.
Be it the tropical rain forests, the Amazon forests, or the deciduous forests, they are highly rich in their species population and variety. This is mainly due to availability of favorable conditions like weather, temperature, rainfall, etc which favors their growth and reproduction. Numerous phyla or classes of species can be found in such equatorial belts rather than in the north or the south pole.
Elevation gradient also plays an role in species richness.
They exhibit considerable molecular complexity and diversity
Answer: the diversification of a group of organisms into forms filling different ecological niches
Explanation:
