When did the protists appear in the fossil record?
Representatives of various types of protist, including the ubiquitous diatoms, have been found as fossils from periods of the Mesozoic Era (100 million to 200 million years ago). What organisms are common in the fossil record? Groups considered to have a good fossil record, including transitional fossils between these groups, are the vertebrates, the echinoderms,…
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