The conservation of the threatened species in their natural habitats is known asa.Species richnessb.Taxonomic diversityc.Ex-situ conservationd.In-situ conservation

The conservation of threatened species in their natural habitats is known as d. In-situ conservation.

Here's why:

a. Species richness refers to the number of different species represented in an ecological community, landscape or region.

b. Taxonomic diversity is a measure of the diversity within an ecological community that incorporates taxonomic difference between species.

c. Ex-situ conservation means conservation which takes place off-site (e.g. in a zoo or botanical garden).

d. In-situ conservation is the process of protecting an endangered species, variety or breed, of plant or animal species in its natural habitat itself, as opposed to ex-situ conservation which is done in a location outside the natural habitat.