Which type of fish fin is rigid and efficient for propulsion and isa found on a fast-cruising fish such as tuna, marlin, and swordfish?
a) heterocercal
b) lunate
c) rounded
d) truncate
e) forked
B
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When 
Po emits a beta particle, it transforms into a new element. What are the atomic number and atomic mass of this new element?
A. atomic number = 85; atomic mass = 218 B. atomic number = 86; atomic mass = 214 C. atomic number = 82; atomic mass = 214 D. atomic number = 84; atomic mass = 219
Which of the following terms refers to the temperature to which air must be cooled in order to become saturated?
A. wet-bulb temperature B. minimum temperature C. dew-point temperature D. freezing point
The local illumination condition in a hillshade view can be influenced by
A. sun's angle B. local slope C. local aspect D. all of these are correct
Of the following, the city with the highest average of annual heating degree-days is:
A) Salt Lake City, UT. B) Cleveland, OH. C) Anchorage, AK. D) Chicago, IL. E) Atlanta, GA.