natural selection
... that Darwin introduced the theory of evolution by natural selection, but was not the first to use the term "survival of the fittest"?
... that <a href="./Charles_Darwin" id="mwCJI" rel="mw:WikiLink" title="Charles Darwin">Darwin</a> introduced the theory of evolution by <b id="mwCJM"><a href="./Natural_selection" id="mwCJQ" rel="mw:WikiLink" title="Natural selection">natural selection</a></b>, but was not the first to use the term "survival of the fittest"?