D. Photoautotrophes The earliest organisms could not depend upon anything but sunlight for food/energy. There was no oxygen in the environment, so it couldn't be an aerobe. Heterotrophs is not the best answer since they wouldn't have consum...
http://answers.yahoo.com/question/index?qid=20091103120...
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Unicellular Organisms The Giant Problem Solvers ... The tiny organisms that were the earliest life forms solved life's basic problems. ... Although some of the offspring were probably less fit than the parents, others were more fit. This allowed improvement, innovation, and adaptation to marginal environments.
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www.world-builders.org/lessons/less/les4/Vles4nb.html
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Scientists call organisms that lack a nuclear membrane prokaryotes. These are probably among the most ancient organisms on Earth. The earliest fossil monerans are more than 3 billion years old. Even though they are composed of only ... Protista: The kingdom of protists includes mostly single-celled, or unicellular, organisms,
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www.amscopub.com/images/file/File_141.pdf
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Unicellular organisms such as magnetic bacteria, calcareous al- gae, and diatoms, all of which are ..... thesis occurs–that is, they originate from the earliest stages ... within the cell, were probably responsible for the magnetic ...
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dx.doi.org/10.1002/anie.200390176
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The earliest true plants were probably unicellular green algae (see ALGA), which first appeared in the Precambrian. The Bryophyta (mosses and liverworts) are known from the Devonian, and the first recorded vascular plants (Tracheophyta) date from the Silurian.
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www.encyclopedia.com/doc/1O13-Plantae.html
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Higher organisms, such as ourselves, are like cellular cities in which groups of cells ... The earliest polymers may have formed in any of several ways - for example, by the heating of dry organic compounds or by the catalytic activity of high concentrations of inorganic polyphosphates or other crude mineral catalysts.
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www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cell&part=A...
www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cell&part=A61
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Fossil evidence of the earliest living organisms now dates back ... The first organisms were most probably ... The earliest organisms were probably unicellular...
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www.mackobza.com/adv_bio_exam1_study.htm
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Question Set 7 Ch. 15-17 ... (D) used to predict when specific groups of organisms will become extinct. ... The earliest organisms were probably unicellular;
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www.columbia.edu/itc/barnard/biology/biobc1001/quizzes/...
www.columbia.edu/itc/barnard/biology/biobc1001/quizzes/BIOBC1001x_q7.html
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Organic compounds break down spontaneously in the presence of __________; hence, life probably never would have emerged if the ancient atmosphere had been the same as the present one. ... Fossil evidence of the earliest living organisms now dates back ... The earliest organisms were probably unicellular...
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www.lew-port.com/10712041113402793/lib/1071204111340279...
www.lew-port.com/10712041113402793/lib/10712041113402793/ap_chapters/ap_ch17-21_rev.htm
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