non-science LOR?

Hello everyone, I have a quick question. Is a LOR from a rangeland ecology professor considered a non-science LOR? How about a LOR from a PI studying cardiac physiology, as technically I'm not taking a science class in this case (not sure if this was a very dumb question to ask ). Also, while I'm on the topic of research, will it be ok (competitively-ok) if I do not have anything published (or even a poster presentation) by the time I apply? I should have it done a few months... non-science LOR?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums