Biology
Biology, 11.10.2019 03:30, anastasiakonni1

During precambrian time, what did organisms not need

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SAT, 25.06.2019 22:00, hannah1571
In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.
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Biology, 27.09.2019 06:10, Delgadojacky0206
Which is not a reason for the lack of a fossil record from the precambrian time? (45 points) a.) like the rocks of the phanerozoic eon, precambrian rocks contain many visible signs of complex life forms b.) precambrian rock has been eroded or metamorphosed over billions of years, and very little of it remains at the surface c.) multi-celled organisms evolved in the oceans during the latest years of the precambrian time d.) the single-celled organisms that existed during that time did not leave easily identifiable fossils
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Geography, 10.10.2019 00:10, Jazs7202
1. which of the following is true about life in the precambrian? a) throughout the entire precambrian there were only single-celled organisms on earth b) there was no oxygen on earth throughout the entire precambrian. c) there were no mammals on earth.239200d o lo d) all life was marine (i.e., found in the ocean) e) all living organisms on earth at this time had a nucleus.
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