51.) What geologic evidence indicates that life could have originated on Earth a

Question

51.) What geologic evidence indicates that life could have originated on Earth as early as 3.85 billion years ago? a.) The Ediacaran fossils are 3.85 billion years old b.) Steinberg has photographic proof from his many visits to the Hadean and Archean c.) Trilobite fossils have been found in rocks from Australia that are 3.85 billion years old d.) Trace fossils (footprints) have been found in rocks from Canada that are 3.85 billion years old e.) That's the age of the oldest chemical fossils. Organic carbon (based on carbon isotope ratios), presumably from living cells, has been found in rocks from Greenland that are 3.85 billion years old 52.) What evidence is preserved in the rock record indicating that Ice Ages occurred in the Precambrian? a.) Fossils of cold-adapted animals like wooly mammoths b.) Fossils of cold-adapted animals like wooly dinosaurs c.) Remnants of Precambrian-aged glaciers can still be found in Antarctica and Greenland d.) Remnants of Precambrian-aged glaciers can still be found in Alaska and Siberia e.) Precambrian-aged tillites and glacial striations on Precambrian bedrock surfaces 53.) One of these statements about Banded Iron Formation (BIF) is false. Which one ? a.) They are sedimentary rocks consisting of alternating thin bands of iron-rich and iron-poor minerals b.) Banded Iron Formations are the world's greatest iron ore deposits c.) Banded Iron Formations formed almost exclusively in the Early Proterozoic Eon d.) BIF could not have formed unless there was a lot of oxygen in the atmosphere at the time e.) BIF could not have formed unless there was little or no oxygen in the atmosphere at the time 54) Why was the Precambrian considered to be lifeless, with no fossils, until as recently as about 60 years ago? a.) Because geologists don't like to study Precambrian-aged rocks b.) Because most Precambrian life was single-celled so their fossils are microscopic and difficult to detect c.) Because geologists are quite lazy d.) Because Precambrian rocks only occur in Antarctica, which was not visited and studied until the 1950s because of the harsh environment e.) Sorry, that is wrong, the Precambrian has always been considered to be lifeless, without fossils, even now 55.) What can be found in the 3.5 billion-year-old sedimentary rocks of the Warrawoona Group in Australia? a.) The oldest possible body fossils of living organisms, consisting of cyanobacteria and stromatolites b.) The oldest fossils of multicellular plants c) The Ediacaran fossils d.) The oldest "chemical fossils" e.) The oldest fossils of multicellular animals

Explanation / Answer

Q51) option e is correct.

rocks from greenland dated to 3.85 billion years ago show isotopic signature of biologica processing.

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