Some corals in the warm pools off Ofu Island can withstand temperatures of 32° to 34 °C without bleaching. So, the researchers

Question

Some corals in the warm pools off Ofu Island can withstand temperatures of 32° to 34 °C without bleaching. So, the researchers set up a controlled laboratory experiment to try to determine why these corals survive in such excessive heat. With regard to the experimental design, what is Dr. Palumbi's control group? 
O Healthy corals from the warm pools
O Dying corals from the cooler water
O Dying corals from the warm waters
O Corals from large reefs around the world

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