Bees (family: Apidae) are important ecologically and economically as primary pollinators of many natural and agricultural systems. Given current concerns about declining numbers of bees, many ...
SVENDSEN 1 showed that the estimate of an earthworm population obtained by hand sorting soil samples was much greater than that by the prevalent method of bringing worms to the soil surface with ...
Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test ...
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