Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Use the chart to answer this question.
Which represents the oldest known single-celled fossils?
A. A
B. B
C. C
D. D
E. E
F. F
Answer: D
Environmental & Atmospheric Sciences
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a. True b. False Indicate whether the statement is true or false
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If you jump up and down for most of the day, at the end of the day, you'll be slightly
A. taller. B. shorter. C. much the same. D. none of the above
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A. the same amount of work. B. twice as much work. C. four times as much work. D. not enough information
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