Question

How did adding animals change the cycles of CO₂ and O₂ in the terrarium?

1) The CO₂ levels increased and the O₂ levels decreased
2) The CO₂ levels decreased and the O₂ levels increased
3) The CO₂ and O₂ levels remained the same
4) The CO₂ and O₂ levels fluctuated

Answer 1

Adding animals to a terrarium increases CO₂ levels and decreases O₂ levels.

Step-by-step explanation:

When animals are added to a terrarium, the cycles of CO₂ and O₂ are affected. The animals breathe in oxygen and exhale carbon dioxide through respiration. This increases the levels of CO₂ in the terrarium while decreasing the levels of O₂. Therefore, option 1) The CO₂ levels increased and the O₂ levels decreased is the correct answer.