altius free FL #14

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akimhaneul

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  1. Pre-Health (Field Undecided)
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I am confused about this question. Why can't it be A?
 

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It is an open channel. No top, per se. If the channel were completely enclosed then choice A would be correct.
 
When they say open channel, do they mean something like this? basically no lid on top?
 

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