Question

So midterm grades came back today, in which I received 4 A's and 2 B's. I would normally be happy about this, except one of the B's was in a class that never had a midterm exam to begin with. It is a one credit / one semester Biology class that is required for Biology majors at my school. Grading is 60% assignments, 40% attendance.

I have a 92% for assignments, and 100% attendance, so I am not really sure what would merit this B. Would it be plausible to contest this grade? The other B was in my "actual" Bio class, so is it possible that the class grades are "shared" since they are both in Biology? Am I missing something here? Thank you.

(The A's were in Chem, Math, and English...equally important pre-reqs. For the most part, I'm not worried)