हानिकारक पदार्थों को शामिल करके हमारे परिवेश को प्रतिकूल रूप से बदलने वाले एजेंटों को ______ 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?