( Pheromones ( ( are ( ( chemical substances ) ( secreted ( by ( ( an animal ) ( that ( are ( ( used ( in communication ) ) ( with ( ( other members ) ( of ( the ( same species ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Pheromones)) (VP (VBP are) (NP (NP (NN chemical) (NNS substances)) (VP (VBN secreted) (PP (IN by) (NP (NP (DT an) (NN animal)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN used) (PP (IN in) (NP (NN communication))) (PP (IN with) (NP (NP (JJ other) (NNS members)) (PP (IN of) (NP (DT the) (JJ same) (NN species)))))))))))))) (. .)))
Pheromones are chemical substances secreted by an animal that are used in communication with other members of the same species.
(ROOT (S (NP (NNS Pheromones)) (VP (VBP are) (VP (VBN released) (PP (IN into) (NP (NP (DT the) (NN environment)) (PP (IN for) (NP (NP (NN communication)) (PP (IN between) (NP (NP (NNS animals)) (PP (IN of) (NP (DT the) (JJ same) (NN species))))))))))) (. .)))