Hiya,
I was in the same situation when I was applying to medical school last year. I was a kinesiology major at the UofI, and I wasn't quite sure about how to designate my major classes for the purposes of AMCAS and AACOMAS.
Basically I thought critically of the content of each of the classes in question and then compared them to the other biology and chemistry classes that I had taken. I then asked myself this important question: "If a school questions why I designated this class as a science class, can I realistically defend that desination and be convincing". If you can't answer 'yes' to that question, then mark it as 'other', but if you feel that you can rationally support a 'science' designation, then mark it as such.
That was my method and I didn't have any of the 8 schools I applied to question my transcripts or designations.
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Rhett
UHS Class of 2004