Assertion: crick's hypothesis | /r/HasProperty | tested
Facets:
value: rigorously
type: MANNER
Source sentences:
text: Thus, although the expansion of the range of Dartford Warbler Sylvia undata in the UK since the 1960s is likely to be due to a lack of severe winters (Gibbons & Wotton 1996), this hypothesis has yet to be tested rigorously.