a material obtained from an organism in order to be a representative of the whole

we need to work on this: Is taking a urine sample a material separation process? If not, we will need to specify what 'taking a sample from organism' entails. We can argue that the objective to obtain a urine sample from a patient is enough to call it a material separation process, but it could dilute what material separation was supposed to be about.

5/29: This is a helper class for now

sample from organism

http://purl.obolibrary.org/obo/IAO_0000002