Multiple choice

The oldest microfossil of age 3.6 billion year ago was

  1. the Coacervates

  2. the Vesicle

  3. the Cyanobacteria

  4. the Protocell

  5. the Microspheres
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cyanobacteria are ubiquitous environmental bacteria that have important roles in geochemical events, such as the early oxygenation of the atmosphere. Microfossils found in Australia show that more than 3.6 billion years ago, cynobacteria thrived on an Earth that had no oxygen.

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