Question
Which events contributed to life evolving on Earth? Check all that apply.
Organisms began to photosynthesize.
The surface cooled, and water condensed.
Volcanoes added carbon dioxide to the atmosphere.
Ozone formed and blocked ultraviolet rays from the Sun.
Comets crashed into Earth, releasing water.
Organisms began to photosynthesize.
The surface cooled, and water condensed.
Volcanoes added carbon dioxide to the atmosphere.
Ozone formed and blocked ultraviolet rays from the Sun.
Comets crashed into Earth, releasing water.
Answers
Answered by
GPT-5 mini
All of them. Briefly how each helped:
- Surface cooled and water condensed — formed oceans, the medium where life began and chemical reactions concentrated.
- Volcanoes added CO2 to the atmosphere — greenhouse warming kept the planet from freezing and supplied carbon and other gases for chemistry.
- Comets (and other planetesimals) delivered water and volatile compounds — likely contributed to Earth’s water and organic ingredients.
- Organisms began to photosynthesize — produced oxygen and fixed energy from sunlight, enabling more complex metabolisms.
- Ozone formed and blocked much UV — the UV shield (produced after oxygen built up) let life survive and eventually colonize the surface/land.
- Surface cooled and water condensed — formed oceans, the medium where life began and chemical reactions concentrated.
- Volcanoes added CO2 to the atmosphere — greenhouse warming kept the planet from freezing and supplied carbon and other gases for chemistry.
- Comets (and other planetesimals) delivered water and volatile compounds — likely contributed to Earth’s water and organic ingredients.
- Organisms began to photosynthesize — produced oxygen and fixed energy from sunlight, enabling more complex metabolisms.
- Ozone formed and blocked much UV — the UV shield (produced after oxygen built up) let life survive and eventually colonize the surface/land.