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7 / 31  Microbial mats __________.
A  are the earliest forms of life on Earth
B  obtained their energy and food from hydrothermal vents
C  are multi-layered sheet of prokaryotes including mostly bacteria but also archaea
D  all of the above

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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