Why a topical forest has a much greater diversity of species than a forest in the northern United States

The high species richness or biodiversity found in tropical rain forests is mainly due to their geographic location and the amount of precipitation they receive. Plants, which are primary producers, can be limited by many things, such as precipitation, sunlight, nitrogen, soil conditions and etc

Explanation:

so basically the northern forest of the us doesnt really get hot

i am pretty sure it is d.