Since its original formulation in 1817 , there have been significant challenges and modifications to the articulata hypothesis as new theories have been accepted ( Darwin 's theory of evolution ) and new technologies have become available ( confocal microscopy , DNA sequencing , genomics ) .
SCONJ PRON ADJ NOUN ADP NUM , PRON AUX VERB ADJ NOUN CCONJ NOUN ADP DET NOUN NOUN ADP ADJ NOUN AUX AUX VERB ( PROPN PART NOUN ADP NOUN ) CCONJ ADJ NOUN AUX VERB ADJ ( ADJ NOUN , NOUN NOUN , NOUN ) .