Name of the group of microorganisms that completely changed the evolution of life on Earth.  - Why can we say that this group contributed to the delimitation of the limits of life? What is their ecological role?  - How did these organisms contribute to the evolution of eukaryotic cells and metabolisms?  - How did these organisms contribute to the establishment of life in extraterrestrial (out-of-water) environments?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Name of the group of microorganisms that completely changed the evolution of life on Earth. 
- Why can we say that this group contributed to the delimitation of the limits of life? What is their ecological role? 
- How did these organisms contribute to the evolution of eukaryotic cells and metabolisms
- How did these organisms contribute to the establishment of life in extraterrestrial (out-of-water) environments?

Expert Solution
Step 1: Earth before the origin of life

4 billion years ago, Earth's conditions were drastically different from what they are now. There was not enough oxygen in the atmosphere, and the ozone layer was not yet shielding the planet from radiation damage. Volcanic activity, lightning, and heavy rain were frequent occurrences. Yet it was in this harsh environment that the first cells were created. Extremophile archaea continue to flourish in these environments. 


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