The estuaries by all ecological standards qualify as renewable natural resource, since they lend themselves to be exploited within sustainable limits.
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Biological motives are directly related to individual’s physiological needs, and eating are necessary for individual’s biological survival. Sex is essential for survival of the species.
Proteins constitute a larger part of the structure of the cells and are present in all tissues. Many proteins have special physiological functions.
The threat of chemical and biological warfare has been talked about frequently in the past years but the likelihood of such occurrence has assumed serious concern in the emerging terrorism dominated environment. Such tactics have been rightly given the name of Weapons of Mass Destruction (WMD).
The differences between clinical death and biological death are : Stoppage of heart beat, pulse and breathing is called clinical death whereas the death caused by degeneration of tissues in brain and other part is called biological death.
Aerobic bacteria use oxygen dissolved in water when breaking down wastes. Scientists can find out how much organic matter the waste water contains by measuring how much oxygen the aerobic bacteria use in breaking it down.
Generally, a fertilized ovum (zygote) develops in to a single individual. But, occasionally, at the time of cleavage of a zygote, the two cells are separated, each producing an individual. Both the individuals are produced at one birth.