Question

what contributed to the composition of our atmosphere?
□ seasons
□ bacteria
□ volcanoes
□ motion of earth

Explanation:

Seasons and Earth's motion relate to climate patterns, not atmospheric composition. Bacteria (e.g., cyanobacteria) produced oxygen early, and volcanoes released gases like CO₂ and water vapor, shaping the atmosphere. Both contribute to its composition.

Answer:

bacteria, volcanoes