Multiple choice general knowledge

Sometime during the late Archaean era an oxygen-containing atmosphere began to develop.

  1. True

  2. False

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

True. The oxygen-containing atmosphere began developing during the late Archaean era due to the emergence of photosynthetic cyanobacteria. This period, known as the Great Oxygenation Event, occurred around 2.4 billion years ago and fundamentally changed Earth's atmospheric composition.