( What ( ( helps ( ( a cactus ) ( survive ( the heat ) ) ) ) ? ) )
(ROOT (SBARQ (WHNP (WP What)) (SQ (VP (VBZ helps) (S (NP (DT a) (NN cactus)) (VP (VB survive) (NP (DT the) (NN heat)))))) (. ?)))
What helps a cactus survive the heat?
(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)))))))))) (. .)))