@@ The recursion-only claim (Hauser et al 2002; Fitch et al 2005) further divide faculty of language into faculty of language-narrow (FLN) and faculty of language-broad (FLB). It supposes that FLN, charactering recursion, is human specific, while FLB is shared with other animals. The claim is biologically seated, a hypothesis on the original and evolution of language. For any biology organism, an evolutional explanation requires to provide plausible answers to mechanistic, functional, ontogentic and phylogenetic question. Accordingly, we argue that language evolution should provide explanation to biology universality, biological adequacy, and meet methodology requirements.