How old are the oldest fossils of more advanced organisms, the eukaryotes?
A) 3.8 billion years
B) 3.5 billion years
C) 2.8 billion years
D) 2.1 billion years
Answer: D
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The mass extinction at the end of the Ordovician wiped out about half of the ____ population
A)dinosaur B)vascular plant C)non-vascular plant D)brachiopod and bryozoan E)stromatoporoid and rugose coral
Which phrase best describes the earth's average surface temperature for the past 900,000 years?
A. a steady warming trend B. fairly steady temperatures until recently C. long periods of cooling and warming D. a steady cooling trend E. fairly steady with a recent cooling trend
A fluffy covering of snow protects sensitive plants and their root systems from damaging low temperatures.?
a. True b. False
A fold in rocks can occupy anywhere from a few centimeters to multiple kilometers
a. True b. False Indicate whether the statement is true or false