Early cyanobacteria spread across shallow areas ofwater to form mats, large colonies of bacteria up to half ayard or meter tall, called _____.
A. plankton
B. lichens
C. aragonites
D. stromatolites
D. stromatolites
Explanation: Early cyanobacteria spread across shallow areas ofwater to form mats, large colonies of bacteria up to half ayard or meter tall, called stromatolites. The surface of thesemats trapped fine particles of sand or mud, while deep inthe mat the bacteria consumed dead cells, causing carbonatecrystals to form, resulting in accretions of limestone.
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