Organic matter decomposes rapidly in Pakistani soils because of ________ conditions, that is why our soils generally have < 1% organic matter:

A channel is said lo be of most economical cross section, for a given cross-sectional area and bed slope when it ________?

IN layer growing period is form ________?

The deficiency of vitamin D in human causes ________?

Lettuce is________?

Proteins fails to work________?