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ARC-Easy / MCAS_2012_8_23649 / Some types of bacteria can only live where oxygen is not present. These bacteria…

Problem

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question

Some types of bacteria can only live where oxygen is not present. These bacteria were well adapted to life on Earth over 2 billion years ago. Which of the following changes caused many of these bacteria to become extinct?

choices

  • the slow movement of tectonic plates
  • the varying temperatures of each season
  • an increase in volcanic activity under the oceans
  • an increase in the number of photosynthetic organisms

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