Biodiversity

The variety of different genes and gene combinations of a particular species

The variety of species on earth or in a particular region, including bacteria and protists

The variety of terrestrial or aquatic ecosystems on earth or in an area

The different biological and chemical processes necessary for the survival of different ecosystems, communities, and species, such as energy flow and nutrient cycling

The number of different types of species in an area

The relative abundance of each species in an area

True

D=N(N-1)/∑n(n-1) where N= total # of organisms in all species and n= total #of organisms in each species

False The Larger the value of D, the larger the density

whether an ecosystem is stable or not

This is determined by whether an ecosystem can withstand, repair, and recover from changes or damage over time.

if an ecosystem is stable, there will be other species on the same trophic level or niche as the species that was lost. Some may be able to take over, keeping the ecosystem resilient to external forces.

True

Although a species may be able to take over for another species in its niche, it will not be able to perform all the functions the previous species could have. This can be dangerous for biological communities as well as human quality of life.

Keytone species define ecosystems. Without these species, the ecosystem would be different or collapse altogether.