Darwinism, Evolutionism, Will to Grow

Though Darwinism and Evolutionism are commonly equated, the fundamental principle of the latter is apparently not that of the former.  Rather, insofar as Evolution is a means to Survival, as is frequently posited in Darwinism, the more fundamental principle is the Will to Live.  Still, there is one case that eludes easy reduction to the latter pattern--the emergence of amphibians from fish.  For, that development consists in a change of environment and subsequent adaptation via mutation, not a mere adaptation to a given environment via mutation.  So, very briefly, at least, the Will to Grow is revealed there as the fundamental principle of Darwinism, and, hence, as a reason why an otherwise well-adapted terrestrial Human Species might, like some fish before it, seek new environments.