For which of the following will the slope of the $Z$ line be steeper?

What is the exact latitudinal range for tropical regions,which harbour more species than temperate or polar areas?

For frugivorous birds and mammals in the tropical forests of different continents,the slope is found to have the value of

Match the correct pair.

Column $- I$	Column $- II$ (Bird species)
$(a)$ Colombia	$(p)\; 1200$
$(b)$ $41^o N$ New York	$(q)\; 1400$
$(c)$ India	$(r)\; 105$
$(d)$ Greenland at $71^o N$	$(s)\; 56$

Given below are two statements.
Statement $I$: There is less species biodiversity in tropical latitudes than in temperate regions.
Statement $II$: Tropical environments, unlike temperate ones, are less seasonal, relatively more constant and predictable.
In the light of the above statements, choose the correct answer from the options given below.

Species diversity is higher at lower altitudes than at higher altitudes because at higher altitudes: