( ( Identify ( ( the relationship ) ( between ( ( the ( speed ( , ( wavelength ( , ( and frequency ) ) ) ) ) ) ( of ( a wave ) ) ) ) ) ) . )
(ROOT (S (VP (VB Identify) (NP (NP (DT the) (NN relationship)) (PP (IN between) (NP (NP (DT the) (NN speed) (, ,) (NN wavelength) (, ,) (CC and) (NN frequency)) (PP (IN of) (NP (DT a) (NN wave))))))) (. .)))
Identify the relationship between the speed, wavelength, and frequency       of a wave.
(ROOT (S (NP (NP (DT The) (NN product)) (PP (IN of) (NP (NP (NP (DT a) (NN wave) (POS 's)) (NN wavelength)) (CC and) (NP (PRP$ its) (NN frequency))))) (VP (VBZ is) (NP (PRP$ its) (NN speed))) (. .)))