Assertion: irish elk | /r/HasProperty | evolutionary mechanism
Facets:
Source sentences:
text: Before the 20th century, the Irish elk, having evolved from smaller ancestors with smaller antlers, was taken as a prime example of orthogenesis (directed evolution), an evolutionary mechanism opposed to Darwinian evolution in which the successive species within the lineage become increasingly modified in a single undeviating direction, evolution proceeding in a straight line void of natural selection.