Background Paragraph: Ocean acidification occurs when excess carbon dioxide in the atmosphere causes the oceans to become acidic. Burning fossil fuels has led to an increase in carbon dioxide in the atmosphere. This carbon dioxide is then absorbed by the oceans, which lowers the pH of the water. Ocean acidification can kill corals and shellfish. It may also cause marine organisms to reproduce less, which could harm other organisms in the food chain. As a result, there also may be fewer marine organisms for humans to consume. 
Story: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.
Which ocean experienced less water acidification over the last decade? Which ocean experienced more water acidification over the last decade? Which ocean had fewer instances of marine organisms reproducing less? Which ocean had more instances of marine organisms reproducing less? Which ocean has a higher content of carbon dioxide in its waters? Which ocean has a lower content of carbon dioxide in its waters? Which ocean lost fewer corals because of its acidity? Which ocean lost fewer shellfish because of its acidity? Which ocean lost more corals because of its acidity? Which ocean lost more shellfish because of its acidity?