The largely tropical ............. rain forest in South America has the greatest biodiversity on earth.

Assertion : Diversity observed in the entire geographical area is called gamma diversity.
Reason : Biodiversity decreases from high altitude to low altitude.

Exploration of molecular,genetic and species level diversity for novel products of economic importance is known as

Which is not true regarding genetic diversity?

$(1)$ More than $\underline A\%$ of the drugs currently sold in the market worldwide are derived from plants.
$(2)$ Although all the biodiversity hotspots put together cover less than $\underline B\%$ of Earth's land area,the number of species they collectively harbour is extremely high,and strict protection of these hotspots could reduce the ongoing mass extinction by almost $\underline C\%$.

Which of the following groups of mammals exhibits the greatest diversity in terms of the number of genera and species?