WILL GIVE BRAINLIEST! 1)How does contaminated runoff affect the delicate balance of ocean life? A: Nitrogen and oxygen are in balance in ocean water. If more nitrogen is added, oxygen is forced out. B: Schools of fish will not travel through areas of polluted water, forcing them to stay in one place, overfeeding on one source of food. C: The food supply for phytoplankton is greatly increased, and they multiply so fast that their predators cannot control their population. Poisons in the runoff kill many of the marine organisms that prey on phytoplankton, which allows them to increase their population greatly, causing an algal bloom.