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Q: Which of the following events define the Proterozoic eon? eukaryotic cells first seen stable continents first bacterial fossils Cambrian explosion oxygen builds up in atmosphere
A: explosion oxygen builds up in atmosphere/The later of the two divisions of the Precambrian Eon, from about 2.5 billion to 540 million years ago. [ The Proterozoic was characterized by the formation of stable continents, the appearance of abundant bacteria and archaea, and the buildup of oxygen in the atmosphere. By about 1.8 billion years ago the oxygen buildup was significant enough to cause
many types of bacteria to die out. At this time eukaryotes, including multicellular algae and the first animals, first appear in the fossil record. (Earth Sciences / Geological Science) the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have lived Compare Archaeozoic adj (Earth Sciences / Geological Science) of or formed in the late Precambrian era ]
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Asked 8/27/2013 9:20:38 AM
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