A biology student takes fish, algae, pond plants, invertebrates, and bottom sediment from a local pond and establishes them in an aquarium. When the system is stable, the student seals it into a large, airtight glass box and leaves the box in a sunny location. After 3 months, the organisms in the aquarium appear alive and healthy. Which statement about the experiment is true?
◦ Some of the energy in the system has moved from one organism to another during the 3 months.
◦ No energy has entered or left the glass box during the 3 months.
◦ During the 3 months, the biomass of animal life was greater than the biomass of plant life.
◦ The air in the glass box contains no carbon dioxide.
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