Lots of background noise causes masking which happens when animals cannot hear important sounds which is difficult for navigation. Without being able to navigate properly animals have the potential to get lost. Sonars can cause hearing loss for marine species which can make them more vulnerable to predators. Sonars can also cause stress levels in marine environment altering their behavior.
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Increases of CO2 weaken the shells of shellfish which make them more vulnerable to dying. Decrease in shellfish population will decrease the population of predators that eat shellfish. Acidic waters will also prevent corals from growing. Corals provide habits for many specifies so without the corals will need to find another habit and they may have to migrate to other locations. Biodiversity will decline. Ocean acidification also make algae more abundant, and algae use up the oxygen in the ocean which will cause oxygen levels to