( Animals ( ( ( are also ) ( the ( only ( organisms ( to ( have ( developed ( ( ( nervous tissue ) and ) ( muscle tissue ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Animals)) (VP (VBP are) (ADVP (RB also)) (NP (DT the) (JJ only) (NNS organisms) (S (VP (TO to) (VP (VB have) (VP (VBN developed) (NP (NP (JJ nervous) (NN tissue)) (CC and) (NP (NN muscle) (NN tissue))))))))) (. .)))
Animals are also the only organisms to have developed nervous tissue and muscle tissue.
(ROOT (S (NP (JJ Only) (NNS animals)) (VP (VBP have) (NP (NP (NN muscle) (NN tissue)) (CC and) (NP (JJ nervous) (NN tissue)))) (. .)))
Only animals have muscle tissue and nervous tissue.