( ( The ( human ( brain stem ) ) ) ( ( ( ( ( is ( the lower ) ) ( ( most part ) ( of ( the brain ) ) ) ) and ) ( controls ( some ( ( very basic ) functions ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ human) (NN brain) (NN stem)) (VP (VP (VBZ is) (ADVP (DT the) (JJR lower)) (NP (NP (JJS most) (NN part)) (PP (IN of) (NP (DT the) (NN brain))))) (CC and) (VP (VBZ controls) (NP (DT some) (ADJP (RB very) (JJ basic)) (NNS functions)))) (. .)))
The human brain stem is the lower most part of the brain and controls some very basic functions.
(ROOT (S (ADVP (RB Not) (RB surprisingly)) (, ,) (NP (JJ controlling) (NN flight)) (VP (VBZ is) (NP (NP (DT the) (NN function)) (PP (IN of) (NP (NP (DT the) (ADJP (RBS most) (JJ developed)) (NN part)) (PP (IN of) (NP (NP (DT a) (NN bird) (POS 's)) (NN brain))))))) (. .)))