प्राकृतिक जैविक प्रक्रियाओं द्वारा नष्ट या विघटित होने वाले प्रदूषकों के कारण होने वाले पर्यावरणीय प्रदूषण को क्या कहा जाता है?

In the context of chemical pollution, what specific fatal reproductive issue is caused in raptor bird populations due to the bioaccumulation of pesticides like DDT within the food chain?

In the districts of Murshidabad and Nadia in West Bengal, which of the following naturally occurring (geogenic) pollutants is found in high levels in groundwater due to sedimentary deposits?