Biotic indices may be used to assess the levels of many pollutants, including acid pollution, in rivers.
Describe the features of species that would make them suitable for use in a biotic
index.

1) name any two states which are leading producer of cotton textile in india 2) wht information technology 3) name any two countries which are leading producers of cotton of cotton textile 4) wht is add to pig iron to convert it into steel

How does central place theory explain patterns in the size and distribution of cities?

What are canada’s major boundaries?