( ( Many ( anaerobic organisms ) ) ( ( ( ( are ( obligate anaerobes ) ) , ) ( meaning ( that ( they ( ( ( can ( ( respire only ) ( using ( anaerobic compounds ) ) ) ) and ) ( will ( die ( in ( ( the presence ) ( of oxygen ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Many) (JJ anaerobic) (NNS organisms)) (VP (VBP are) (NP (JJ obligate) (NNS anaerobes)) (, ,) (S (VP (VBG meaning) (SBAR (IN that) (S (NP (PRP they)) (VP (VP (MD can) (VP (VB respire) (ADVP (RB only)) (S (VP (VBG using) (NP (JJ anaerobic) (NNS compounds)))))) (CC and) (VP (MD will) (VP (VB die) (PP (IN in) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NN oxygen))))))))))))) (. .)))
Many anaerobic organisms are obligate anaerobes, meaning that they can respire only using anaerobic compounds and will die in the presence of oxygen.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN anaerobic) (NN organism)) (VP (VP (VBZ does) (RB not) (VP (VB need) (NP (NN oxygen)) (PP (IN for) (NP (NN growth))))) (CC and) (VP (VBZ dies) (PP (IN in) (NP (PRP$ its) (NN presence))))) (. .)))
A(n) anaerobic organism does not need oxygen for growth and dies in its presence.