Question

species diversity can be described as
the number of different species in an area
the different genes contained within all members of a population
species divided into different communities
a variety of habitats, communities, and ecological processes between ecosystems

Explanation:

Species diversity refers to the number of different species in a given area. Genetic diversity is about genes within a population, and ecosystem diversity involves habitats, communities and ecological processes. The description here matches the concept of species diversity as the number of different species in an area.

Answer:

the number of different species in an area