( ( The descendants ) ( ( ( have backbones ) ( built ( from ( ( ( concave vertebrae ) ( the shape ) ) ( of ( hockey pucks ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS descendants)) (VP (VBP have) (ADVP (RB backbones)) (VP (VBN built) (PP (IN from) (NP (NP (ADJP (JJ concave) (JJ vertebrae)) (DT the) (NN shape)) (PP (IN of) (NP (NN hockey) (NNS pucks))))))) (. .)))
The descendants have backbones built from concave vertebrae the shape of hockey pucks.
(ROOT (S (NP (NNP Vertebrata)) (VP (VBP are) (VP (VBN characterized) (PP (IN by) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NN backbone))))))) (. .)))
Vertebrata are characterized by the presence of backbone.