Help which of the following describes species diversity of a community?

the number of different species present in the community
the measure of species richness and relative abundance of different species
the measure of species richness and relative abundance of different specie
the number of mutualistic interaction in a community

Species richness is the number of different species represented in an ecological community, landscape or region.[1] Species richness is simply a count of species, and it does not take into account the abundances of the species or their relative abundance distributions. Species richness is sometimes considered synonymous with species diversity, but the formal metric species diversity takes into account both species richness and species evenness.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion