The reasons why DDT is classified as a persistent organic pollutant are;
- DDT can be used to control diseases, such as malaria and typhus, that are spread by insects.
- DDT is detected in food worldwide and the general human population is most commonly exposed to the toxin through food.
Persistent Organic Pollutants can be regarded as toxic substances which are made up of organic chemical compounds.
These are industrial chemicals such as;
DDT is classified as a persistent organic pollutant because of it's usefulness in control diseases and it is been found in food stuff across the globe.
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brainly.com/question/14154063
Answer:
add an ark under or next to it
Explanation:
Answer: light from other galaxies is red.
Explanation: Astronomers have observed that light from the distant object in the universe is shifted towards the frequency of red color which indicates that those object are receding or moving away from the planet earth.This phenomena was termed as Red shift .Same thing goes for galaxies which are very far away from the planet earth.
Where as if galaxies were moving towards the the planet earth their light would have shifted toward the frequency of blue color termed as blue shift.