Which phenomenon was observed in Lake Victoria of East Africa?

What could have triggered mass extinctions of species in the past?

Poaching of tiger is a burning issue in today's world. What implication would this activity have on the functioning of the ecosystem of which the tigers are an integral part?

Why do exotic species sometimes become invasive and start spreading rapidly?

The primary cause of biodiversity loss is .....

Give scientific reasons: Habitat loss is the most important cause of the extinction of our wildlife.