Pesticides, such as ddt, often have harmful effects on aquatic ecosystems. one harmful effect would be that these pesticides
a) cause fish to become sterile and unable to lay eggs.
b) cause algae and plants to overgrow and pollute the water when they die.
c) accumulate in animals and build up in toxic concentrations as they pass through the food chain.
d) eliminate most of the algae and plants in the food chain, causing animals to starve, at higher levels of the food chain.