Which of the following features best describes this object?
A. spiral galaxy
B. star
C. nebula
D. supernova
Answer: C
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Complete the following nuclear equation:
Bi ? ?? + 
e
A.
 Pb |
B.
 Pb |
C.
PoD.
 Th |
E. none of the above
The requirement that cars must be designed so they can be repaired or recycled, rather than thrown away, is a component of the
A. Green Party's political agenda B. U.S. auto manufacturers' goals C. Dutch Green Plan D. World Trade Union Plan for global manufacturing E. Japan's energy efficiency laws
Giant squid have been found so infrequently because
1.they’re afraid of humans.
2.deep-sea creatures as large as this are rare.
3.there are now fewer sperm whales for them to eat.
4.most deep-sea nekton are elusive and rarely surface.
Jet contrails
A) only form in the lower stratosphere. B) last longest when they form in air that is cold with little water vapor. C) probably contribute to global warming. D) are essentially altostratus clouds. E) all of the above