The survival of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae, are being threatened, experts say, not only by pollutants like agricultural runoff, oil slicks, and trash, but also by dropped anchors, probing divers, and global warming.
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Aare being threatened, experts say, not only by pollutants like
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Bare being threatened, experts say, by not only pollutants such as
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Cis not only being threatened, experts say, by pollutants such as
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Dis not only being threatened, experts say, by pollutants like
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Eis being threatened, experts say, not only by pollutants such as
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正确答案: E