Which of the following statements contains a true analogy? as increased amounts of carbon dioxide are absorbed into the oceans, their waters are becoming more acidic. hidden beneath the ocean waters, reefs are also some of the oldest ecosystems on the planet, reflecting thousands of years of history. coral polyps have tiny tentacles that act like arms to capture their food from the water and protect themselves. an estimated 20 percent of the world’s reefs are damaged beyond recovery and about half of the remaining coral reefs are under risk of collapse.