I. $\underset{\left(\mathrm{Poles}\right)}{\mathrm{Higher} \mathrm{latitud}}e\stackrel{\mathrm{Biodiversity} \mathrm{increases}}{\to }\underset{\left(\mathrm{Equator}\right)}{\mathrm{Lower} \mathrm{latitude}}$

II. $\underset{\left(\mathrm{Poles}\right)}{\mathrm{Higher} \mathrm{latitud}}\mathrm{e}\stackrel{\mathrm{Biodiversity} \mathrm{decreases}}{\to }\underset{\left(\mathrm{Equator}\right)}{\mathrm{Lower} \mathrm{latitude}}$

III. $\underset{(\mathrm{Mountain} \mathrm{top})}{\mathrm{Higher} }\mathrm{altitude}\stackrel{\mathrm{Biodiversity} \mathrm{increases}}{\to }\underset{(\mathrm{Sea} \mathrm{level})}{\mathrm{Lower} \mathrm{altitude}}$

IV. $\underset{(\mathrm{Mountain} \mathrm{top})}{\mathrm{Higher} \mathrm{altitud}}e\stackrel{\mathrm{Biodiversity} \mathrm{decreases}}{\to }\underset{(\mathrm{Sea} \mathrm{level})}{\mathrm{Lower} \mathrm{altitude}}$

Which of the matches given above is/are correct?

Biodiversity is not uniform throughout the world because it is affected by many factors. It increases from poles to equator, i.e. from higher to lower latitude and vice-versa. It also increases from higher altitude to lower altitude, i.e. from mountain top to sea level and vice-versa. Species diversity decreases as we move away from equator towards the poles. The tropics tend to harbour more species than the temperate or polar areas.