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

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.

David Tilman suggested:

Explain briefly the 'rivet popper hypothesis' of Paul Ehrlich.

Who helps in maintaining species diversity in a biological community?

What characteristics make a community stable?