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Division is a mathematical operation where we split a number into equal parts. The key terms and rules are:

1. Dividend: The number being divided.
2. Divisor: The number dividing the dividend.
3. Quotient: The result of the division, showing how many times the divisor fits into the dividend.
4. Remainder: The leftover amount when the division is not exact.

Simplified Rules:

1. Division by zero is undefined.
2. Any number divided by one is equal to the original number.
3. Zero divided by any non-zero number is zero.
4. Division of zero by any non-zero number is zero.
5. If the dividend is smaller than the divisor, the quotient is zero, and the dividend is the remainder.
6. When the dividend is not divisible by the divisor, there is a remainder.
7. The signs of the dividend and divisor determine the sign of the quotient, and the remainder has the same sign as the dividend.

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Stagnant water poses various health risks and can be harmful due to the following reasons:

1. Breeding Ground for Bacteria and Viruses: Stagnant water provides an ideal environment for the growth and multiplication of bacteria and viruses. These microorganisms can include harmful pathogens such as E. coli, Salmonella, and various types of viruses. When humans or animals come into contact with or consume water contaminated with these microorganisms, it can lead to waterborne diseases like diarrhea, cholera, typhoid fever, and other gastrointestinal illnesses.

2. Mosquito Breeding: Stagnant water serves as a breeding ground for mosquitoes. Mosquitoes lay their eggs in stagnant water, and within a short period, these eggs hatch into larvae and eventually mature into disease-carrying mosquitoes. Mosquito-borne diseases like malaria, dengue fever, Zika virus, and West Nile virus can be transmitted to humans through mosquito bites, posing significant health risks.

3. Algal Blooms and Harmful Toxins: Stagnant water can experience an overgrowth of algae, leading to algal blooms. Certain types of algae produce toxins, such as cyanobacteria, also known as blue-green algae. Exposure to these toxins through direct contact with the water or inhalation of contaminated aerosols can cause skin irritation, respiratory problems, and in severe cases, liver damage or neurological effects.

4. Foul Odor and Aesthetics: Stagnant water often emits a foul odor due to the decomposition of organic matter in the water. This unpleasant smell can significantly impact the surrounding environment, making it unpleasant for humans to be near or live in such areas. Additionally, stagnant water may appear murky, discolored, or filled with debris, negatively affecting the aesthetic appeal of an area.

5. Structural Damage and Infrastructure Concerns: Prolonged stagnation of water can lead to structural damage to buildings and infrastructure. For example, when stagnant water accumulates around foundations, it can weaken the structures and contribute to issues like mold growth, deterioration of building materials, and even potential collapses.

To mitigate the harmful effects of stagnant water, it is crucial to eliminate standing water through proper drainage systems, regular cleaning, and maintenance. Additionally, public awareness about the risks associated with stagnant water and the importance of maintaining clean water sources is essential for promoting healthier environments and preventing the spread of waterborne diseases.