Which of the following communities is more vulnerable to invasion by outside animals and plants?

$A$ species becomes prone to extinction due to

What are the major causes of species losses in a geographical region?

These are regarded as major causes of biodiversity loss:
$A$. Over-exploitation $B$. Co-extinction $C$. Mutation $D$. Habitat loss and fragmentation $E$. Migration
Choose the correct option:

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

Which of the following is the most important cause for the extinction of animals and plants?