As biodiversity increases in an ecosystem,its stability $...$

How is biodiversity important for ecosystem functioning?

Which of the following characteristics are seen in a stable community?
$i$. It is strong enough to withstand environmental disturbance and recovers quickly.
$ii$. It is resistant to invasive species.
$iii$. It exhibits constant change in biomass production over a period of time.
$iv$. It has more species diversity.

More than $25\; \%$ of the drugs are derived from plants. What benefit does this describe?

$...............$ found that plots with more species showed less year-to-year variation in total biomass. Increased diversity contributes to higher productivity.

What are the effects of biodiversity on ecosystem functioning?