The world's most problematic aquatic weed is ......

If birds at high altitudes are rarely seen or become extinct,which of the following plants associated with them will also become extinct?

The 'Evil Quartet' represents the major causes of

Biodiversity loss occurs due to the reasons given below:
$(i)$ Habitat loss and fragmentation
$(ii)$ Co-extinction
$(iii)$ Over-exploitation
$(iv)$ Alien species invasion
Identify the correct reasons.

What is co-extinction? Explain with a suitable example.

In the modern era,who is the greatest predator of humans in the world?