Which of the following is the most stable conformation of cyclohexane?
A) boat
B) chair
C) envelope
D) twist
B
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Why do most fish and marine mammals have the same torpedo-like, streamlined shape?
a) A streamlined shape presents a greater surface area-to-volume ratio, which allows easier regulation of internal heat. b) If you are going to move through a substance, like water, it is necessary to have a head and eyes at one end and a tail at the other. c) Streamlining looks better to the opposite sex, so it leads to greater reproduction. d) The streamlined shape minimizes energy expended to move through the water. e) They can swim faster with streamlined shapes.
Barnacles are an example of a heterotroph that feeds by ________ feeding
A) active predation B) deposit C) filter D) passive predation E) photosynthetic
The Clean Water Act has turned out to be ________ in achieving its point source goals.
A. marginally effective B. a disaster C. very effective D. ineffective
How does glacial ice form?
A) Frigid conditions cause direct freezing of atmospheric water vapor onto land surfaces. B) Melting snow accumulates in a basin and is refrozen as the climate cools. C) Sea ice becomes attached to land surfaces and develops into glacial ice. D) Snow is retained for many years and compacted into ice by overlying snow.