( ( 9 . ) ( ( Explain ( how ( chemoautotrophs ( differ ( from ( photosynthetic autotrophs ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD 9) (. .)) (VP (VBZ Explain) (SBAR (WHADVP (WRB how)) (S (NP (NNS chemoautotrophs)) (VP (VBP differ) (PP (IN from) (NP (JJ photosynthetic) (NNS autotrophs))))))) (. .)))
9. Explain how chemoautotrophs differ from photosynthetic autotrophs.
(ROOT (S (NP (NNS Photoautotrophs) (CC and) (NNS chemoautotrophs)) (VP (VBP are) (NP (NP (CD two) (JJ basic) (NNS types)) (PP (IN of) (NP (NNS autotrophs))))) (. .)))