“Quick/Easy” 2 or 3 credit science course?

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Good evening all,
To obtain more certification, I am 2 credits short in science. I have a 4 credit Biology life science course with lab, a 3-credit human biology course, a Basic Botany 3 credit course, and Environmental Studies (3 credits). So I have a total of 13 and need either a 2 or 3 credit science course for my additional certification. It can be lower level.

I am trying to stay away from CLEP/SAYLOR study on your own approach so for the lowest cost I am thinking either StraighterLine, onlinedegree or Study.com (or maybe I’m missing another similar platform).

Any ideas for that last 2 or 3 credit science course that is pretty quick/easy from a StraighterLine, Study.com, or onlinedegree?

Thanks in advance!


EDIT: I forgot to mention that the course needs to be accepted through TESU