Fact 1: Biodiversity generally increases from the poles to the equator.

Fact 2: Biodiversity is equated with the number of different organisms present in a habitat .

Given the two facts above, answer the question "What increases in habitats from the poles to the equator?" with the following options: 
- The number of individuals
 - sub-units of species
 - the Arctic
 - different organisms' numbers
 - ice
 - biological diversity
 - penguins
 - heat and light


 

    different organisms' numbers     