Baleen whales lack ________.
A. a blowhole
B. a dorsal fin
C. teeth
D. flukes
E. an ear opening
Answer: C
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How much has CO2 varied in the Vostok record? What were the highest and lowest values? What was the range of CO2 values?
Examine Figure 18.2. The Vostok ice core is 3310 m (10,860 ft) long. The full record extends back to 422,000 years before the present. The figure shows CO2 in parts per million (ppm) and temperature anomalies in Celsius degrees. What will be an ideal response?
Within Northern Africa is a region that in Arabic means "place of sunset," suitably titled at the far west side of this region.
A. the Maghreb B. the Rub al Khali C. the Negev D. the Levant
Four of the following are part of the saltwater or marine aquatic life zones. Which one is the exception?
A. oceans B. estuaries C. inland wetlands D. coastal wetlands E. mangrove forests
Metamorphic rocks are classified primarily on
A. mineralogy-the presence or absence of quartz B. chemical composition C. environment of deposition D. texture-the presence or absence of foliation