['they', 'assimilate', 'species', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'learn-14-2', "Synset('category.n.02')", 'EmptyParameter', 'EmptyParameter']
They will 'assimilate' more species to prove their worthiness.
<PRP> will 'assimilate' more Synset('category.n.02') to prove <PRP> Synset('quality.n.01').