David Tilman suggested:

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.

According to the Rivet Popper Hypothesis,rivets represent $........$.

Outdoor plot experiments were conducted by

State the contributions of the following scientists:
$(i)$ Alexander von Humboldt
$(ii)$ David Tilman
$(iii)$ Paul Ehrlich

Which of the following statements are true?
$I$. Species diversity provides stability to the ecosystem.
$II$. Communities with more species tend to be more stable than those with fewer species.
$III$. Ecosystems with higher biodiversity are more productive than ecosystems with lower biodiversity.
$IV$. Biodiversity is not essential for the maintenance and health of the ecosystem.
Choose the correct option.