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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In 1861, the First Battle of Manassas, or Bull Run,
A. ended in a stalemate. B. saw a much larger Union force oppose Confederate troops. C. was a victory for the Confederates. D. proved a severe blow to Confederate morale. E. was witnessed by President Lincoln.
Pope John instructed the Vatican II council to examine which of the following issues?
A. atheism B. birth control C. poverty D. All of these answers are correct.
Which city became the center of the steel industry in the late nineteenth century?
a) Pittsburgh b) Washington, D.C. c) Seattle d) El Paso
The stock market crash of 1929 turned into
a. the deepest, most widespread depression in history. b. an economic boon to the "common man," as he was now able to afford stock. c. a minor depression followed by an economic recovery. d. a "limited" depression in some countries, but not most Western countries. e. a depression for the United States only.