Reproduction in the average total cost of producing a products as the firm expands the size of plants (its output) in the long run________?

Direct runoff is the sum of ________?

Clear water with organic matter or sediment and minimum biological activity is known as________?

The science of water which deals with the depletion and replenishment of water resources is called________?

Gurdaspur borer is pest of________?

An organism or cell having a chromosome number that is higher than the exact nultiple of the basic number is known as________?