B. are more difficult to control than point sources. This is because A. is wrong (point source), and C. is wrong, because it doesn't necessarily cost less or more to identify the sources. D. may be right, as non point sources are natural, such as snow melts or rain.
Answer:
Option B, Halogens
Explanation:
Halogens are group of chemicals that consists of chemicals such as iodine, chlorine, and fluorine and are used as disinfectant.
Chlorine is the most commonly used halogen. It is sometimes mixed with metals to form compounds such as sodium hypochlorite or Bleach which are used as common household disinfectant
All Hypochlorite compound including sodium and calcium hypochlorites, are used to clean the water of swimming pools.
Hence, Bleach is an example of halogens
Option B is correct.
Answer:
The answer is option D. The retina is interrupted by the optic nerve.
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Answer:
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