( Pheromones ( ( are ( ( the ( best-known form ) ) ( of ( communication ( in ants ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Pheromones)) (VP (VBP are) (NP (NP (DT the) (JJS best-known) (NN form)) (PP (IN of) (NP (NP (NN communication)) (PP (IN in) (NP (NNS ants))))))) (. .)))
Pheromones are the best-known form of communication in ants.
(ROOT (S (NP (NNS Pheromones)) (VP (VBP enable) (NP (NP (NN communication)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ vital) (PP (IN for) (NP (NP (NNS organisms)) (PP (IN like) (NP (NP (NNS ants)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN in) (NP (DT a) (JJ large) (NN community)))))))))))))))) (. .)))