( ( A ( cactus spine ) ) ( ( imaged ( with ( a ( scanning ( electron microscope ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN cactus) (NN spine)) (VP (VBD imaged) (PP (IN with) (NP (DT a) (JJ scanning) (NN electron) (NN microscope)))) (. .)))
A cactus spine imaged with a scanning electron microscope.
(ROOT (S (NP (NP (DT The) (NNS spines)) (PP (IN of) (NP (DT a) (NN cactus)))) (VP (VBP help) (SBAR (S (NP (PRP it)) (VP (VBP survive) (SBAR (IN because) (S (NP (NNS spines)) (VP (VB protect) (NP (DT the) (NN cactus)) (PP (IN from) (NP (NNS animals)))))))))) (. .)))