List any two major causes other than anthropogenic causes of the loss of biodiversity.

According to $IUCN$, when a taxon is facing an extremely high risk of extinction in the immediate future, it is

In the following pie chart of global invertebrate diversity, what does $A$ and $B$ represent?
 

The least porous soil among the following is a

Manas sanctuary is located at

Soil formed after leaching and rich in Al and Fe is