What is the {studied by} and the {this taxon is source of} of {Tree} ?
What is the study and taxonomy of trees?
What is the taxonomy and study of trees?
SELECT ?k ?o WHERE { resource:tree property:this_taxon_is_source_of ?o . resource:tree property:studied_by ?k }
 SELECT ?ans_1 ?ans_2 WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q10884> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2579> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_1. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q10884> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1672> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_2. } 
SELECT ?ans_1 ?ans_2 WHERE { wd:Q10884 wdt:P2579 ?ans_1 . wd:Q10884 wdt:P1672 ?ans_2 }
forestry science Wood