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What is the cost-benefit relationship regarding sewage treatment as a method to fight water pollution?
To treat sewage is much cheaper for society. The non treated sewage pollutes rivers, lakes and the sea, being a cause of diseases transmitted by water. For the society the costs of these diseases are much higher than the cost of the sewage treatment.
One of the most economical systems to treat sewage is the aerobic treatment system, reservoirs kept much oxygenated for aerobic bacteria to decompose organic material.
Lungs - Respiratory Organs In arachnid arthropods such as scorpion and spider, respiration takes place by means of book lungs. There are four pairs of these structures in the
Explain Advantages and Disadvantages of Spread Plate Method? The advantages and disadvantages of spread plate method are highlighted next. Advantages 1. It is useful fo
Silviculture: It concerned with the cultivation of timber yielding plants. Silviculture is the way of controlling the growth, establishment, composition, health or quality of fore
what is allometry?
Pressure Gradient You know that air pressure is the weight of the atmosphere over a unit area of the earth's surface. The average air pressure at sea level is approximately 1 k
What are the different mechanisms responsible for corneal avascularity? Various mechanisms responsible for its avascularity are as follows: a) Chemical Theory: I) Role o
EXPLAIN THE CONSTITUENT OF FOOD GROUPS AND THEIR SOURCES
Introduction to Metabolism An organism have to be managed its cellular organization and internal equilibrium despite the external forces which act upon it. Cells take in nutrie
Signs and Symptoms Decreased urine output Bloody or brown colour urine Edema Malaise Mild headache Gastrointestinal disturbances
What are the Fat Requirements of athletes? Fats are the body's other major energy source. It is a well known fact that fat is a highly concentrated source of energy
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