( ( The ( pollen grain ) ) ( ( has ( ( ( ( two ( protective walls ) ) ( the intine ) ) and ) ( the exine ) ) ) . ) )
(ROOT (S (NP (DT The) (NN pollen) (NN grain)) (VP (VBZ has) (NP (NP (NP (CD two) (JJ protective) (NNS walls)) (NP (DT the) (NN intine))) (CC and) (NP (DT the) (NN exine)))) (. .)))
The pollen grain has two protective walls the intine and the exine.
(ROOT (S (NP (DT Each) (NN pollen) (NN grain)) (VP (VBZ has) (NP (NP (CD two) (NNS coverings)) (: :) (NP (NP (NP (DT the) (NN exine)) (PRN (-LRB- -LRB-) (NP (NP (JJR thicker)) (, ,) (NP (JJ outer) (NN layer))) (-RRB- -RRB-))) (CC and) (NP (DT the) (NN intine))))) (. .)))