Without greenhouse gases, earth's temperature would be
A. 15°C.
B. 68°C.
C. ?18°C.
D. 0°C.
Answer: C
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Which of the following statements about taxol is false?
A) Taxol is no longer obtained primarily from the bark of the Pacific yew. B) taxol and paclitaxel are two different but related anticancer drugs. C) taxol has been successfully synthesized by chemists. D) taxol inhibits cell division by preventing the disassembly of microtubules.
The current rise in global sea level can be attributed to ________
A) the tectonic lowering of continents B) increases in rainfall C) increases in the flow of large rivers D) melting of glaciers E) increases in evaporation
Which of the following places would NOT be a good place to visit a reef?
A. islands in the southwestern Pacific Ocean B. shallow seas that are relatively free of suspended sediment C. shallow, clear waters off Iceland D. the area offshore of northeastern Australia E. the Caribbean
Icebergs are formed when ___________
a) salty seawater freezes and drifts out to sea b) ice breaks off from coastal glaciers that reach the sea c) gigantic pieces of frozen slush are taken out to sea d) ice floes expand and raft on top of one another e) large amounts of hail coalesce into a large mass