A student creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. The next day, all the snails are dead. What is the most likely cause of their death? O A. The rates of cellular respiration and photosynthesis in the tank were both too low. B. The rates of cellular respiration and photosynthesis in the tank were both too high. C. The rate of cellular respiration in the tank was much higher than the rate of photosynthesis. D. The rate of photosynthesis in the tank was much higher than the rate of cellular respiration.