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How long ago are prokaryotes believed to have evolved on Earth? A. 3.5 million years B. 1.5 billion years C. 2 billion years D. 3.5 billion years
Weegy: D. 3.5 billion years. The oldest ancient fossil microbe-like objects are dated to be 3.5 Ga (billion years old), approximately one billion years after the formation of the Earth itself. User: Two of the tenets of the cell theory are: All living things consist of one or more cells, and the cell is the smallest unit of life that displays all of the characteristics of life. Which is the third tenet? A. All cells transform energy. B. All cells have cell membranes. C. All cells come from pre-existing cells. D. All cells can become any other type of cell. Weegy: D. All cells can become any other type of cell. he third of the original tenets, Schwann and Schleiden thought cells formed through spontaneous generation, similar to crystals. [ Eventually this tenet was disproven, and a scientist named Rudolph Virchow correctly revised the tenet to state that "All cells only arise from pre-existing cells." The modern understanding of cells explains that they divide to create new cells. One cell essentially splits to make two, and two to make four, etc. Spontaneous generation is not involved. ] (More)
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Updated 215 days ago|3/24/2014 9:26:21 AM
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2 billion years are prokaryotes believed to have evolved on Earth.
Added 215 days ago|3/24/2014 9:26:21 AM
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