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Through the normal genetic processes of breeding and selection, man has been
able to modify many natural varieties of plants and animals to produce
characteristics that he desires — quality of produce, quantity of yield, time of
Unfortunately, pesticides are not very selective, physiologically, among the
arthropods, for they usually kill broad groups of organisms — including many
species of natural enemies, which are generally more susceptible to pesticides
than the ...
This means that the natural "growth" of soil thickness ranges from one to ten
millimetres per year. It shows that under the conditions of natural denudation, a
well-regulated dynamic system exists. The three basic processes of the system ...
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review