How many biodiversity hot spots have been identified in the world?

How many countries pledged their commitment to achieve by $2010$,a significant reduction in the current rate of biodiversity loss at global,regional,and local levels in the World Summit held in $2002$?

Insects are the most numerous,with an estimate of:

Within a region,species richness increases with an increasing explored area,but only up to a limit. Which naturalist proposed this statement?

Which of the following terms is used to refer to the number of varieties of plants and animals on Earth?

Study the following statements and select the correct option given below:
Statement-$I$: Biodiversity is the variety of features of life observed in the living organisms at different levels within a defined area.
Statement-$II$: Living organisms' attempt to accommodate with different environmental conditions forms the basis of diversity.