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Learning Outcomes  👉 What is biodiversity  👉 Origin of biodiversity  👉 Nature of biodiversity  👉 Interrelationships of organisms  👉 How to measure biodiversity  👉 Biodiversity of Bangladesh  👉 Risks and remedies of biodiversity  What is Biodiversity? The term biodiversity describes the great variety of life on Earth. Biodiversity refers to the variety of living things, including plants, animals, and microorganisms. We don't know for sure exactly how many different organisms there are on Earth. However, scientists estimate that there are about 8-14 million (80 to 140 lakh) different species of organisms on this Earth. Some believe that the number is higher. But whatever the number, most of these organisms are unknown to us. Only 1.2 million (12 lakh) species have been identified and described so far, most of which are insects. This means that billions of other organisms are still mysterious and unknown to us. Origin of Biodiversity The unique characteristics of all sp

Which of the following best describes why DDT is classified as a persistent organic pollutant?

Which of the following best describes why DDT is classified as a persistent organic pollutant?

DDT is classified as a persistent organic pollutant because it is a synthetic organic compound that is resistant to environmental degradation. It has a long half-life, which means that it can persist in the environment for a long time after it is released, leading to its accumulation in the food chain.

DDT is not easily broken down by natural processes, and once it enters the environment, it can persist for many years. This persistence allows it to accumulate in the tissues of animals and plants, leading to biomagnification in the food chain. As a result, DDT and its breakdown products can have harmful effects on the health of animals and humans, including cancer, reproductive problems, and developmental issues.

The persistence of DDT and its potential health effects led to its ban in many countries in the 1970s. However, due to its persistence, DDT and its breakdown products can still be found in the environment and in the tissues of animals and humans today.


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