Which of the following is most likely to be preserved as a fossil?
A. a complete large organism
B. an organ like an eye or lung
C. an organism that died on land
D. a leaf or stem
E. a bone or shell
E. a bone or shell
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Examine Figure 48.5 in your text. According to this figure, mean temperature changes from 1940–1980 and 1999–2008 have been greatest:
A. in Australia. B. in southern Africa. C. near the equator. D. in South America. E. in the northern hemisphere.
Which of the following equations best summarizes photosynthesis?
A) 6 CO2 + 6 H2O + 6 O2 ? C6H12O6 B) 6 CO2 + 6 H2O ? C6H12O6 + 6 O2 C) 6 CO2 + 6 O2 ? C6H12O6 + 6 H2O D) C6H12O6 + 6 O2 ? 6 CO2 + 6 H2O
When did the level of oxygen in Earth's atmosphere become high enough to sustain aerobic respiration?
A) 1.0 billion years ago B) 1.5 billion years ago C) 2.7 billion years ago D) 3.5 billion years ago
Photosynthetic organisms of the open oceans are confined to the upper
A. two hundred meters. B. two hundred kilometers. C. two hundred centimeters. D. two hundred millimeters. E. two thousand kilometers.