A Biology Student Takes Fish, Algae, Pond Plants, Invertebrates, and Bottom

Multiple Choice

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?

A) No energy has entered or left the glass box during the 3 months.
B) Some of the energy in the system has moved from one organism to another during the 3 months.
C) The air in the glass box contains no carbon dioxide.
D) During the 3 months, the biomass of animal life was greater than the biomass of plant life.