What May Have Brought an End to the Nearly Worldwide

question 6

Multiple Choice

What may have brought an end to the nearly worldwide glacial episode called snowball Earth?

• A) Oxygen released by sea-floor volcanism at mid-ocean ridges and hot spots resulted in increased ocean water temperatures.
• B) The K-T boundary event took place.
• C) There was increased photosynthetic activity by opisthokonts.
• D) Carbon dioxide entered the atmosphere from volcanic eruptions.

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