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(a) Give two examples of diseases which can be spread by contaminated drinking water.
(b) How can the spread of such diseases be prevented?
(a) Typhoid and cholera can be spread by contaminated water.
(b) The spread of such diseases can be stopped by (i) Effective disposal of sewage,
(ii) Purification of drinking water.
Dengue Dengue fever is a viral disease transmitted by mosquito bites that occurs worldwide in tropical and subtropical areas. Major epidemics have occurred in recent years in
Human Impact on Carbon Cycle Human activities have greatly influenced the carbon cycle. The discharge of CO 2 , into the atmosphere is steadily increasing owing to burning of
Explain the Root-End Preparation - endodontic surgery a. Class I type preparation, 3mm depth. b. Tips are designed in a length of 3 mm to prevent procedural errors. c. Ul
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Summary of Accident Causation In the light of above theories it is concluded that the decision of workers to work safe is largely influenced by external factors such as meetin
explain protozoa taxonomy
What are the main biological functions of water? Water is the basic solvent for chemical reactions of living beings; it is the major means of substance transportation in the ce
does crossing over occur in all the homologous chromosomes???
Q. What are the parathyroids? Where are they located and what are the hormones secreted by these glands? The parathyroids are four small glands embedded two in each posterior f
habitat of protozoa .
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