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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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
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