Answer:c. biological magnification.
Explanation: Biological magnification which is also known as bioamplification,refers to an intensive accumulation of toxins substances in organisms tissues. This occurs through the food chain , when these substances aren't broken down naturally ,when their concentration get higher as the food chain moves up,and when they are not excreted due to their insoluble nature.
Biological magnification are causes by accumulated pesticides , heavy metals which are found in water as they get washed away from their original source , they get into the diet of aquatic life and move up the food chain as zooplankton get affected by them and then get eaten by fishes which also get affected and humans comes in to eat the same affected fishes and they get more and more cincetrated as they move through the food chain
