Function to get all CBD pathays of introdution at level 1 (pathway_level1)
and level 2 (pathway_level2). Added pathway unknown at level 1 and level
2 for classifying taxa without pathway (at level 1 or level 2) information.
Function to get all CBD pathays of introdution at level 1 (pathway_level1)
and level 2 (pathway_level2). Added pathway unknown at level 1 and level
2 for classifying taxa without pathway (at level 1 or level 2) information.