# The age of onset of [[puberty|sexual maturity]] is rapidly changing, suggesting that life is in a short-term rather than long-term equilibrium.<ref>For evidence of a rapidly changing age for sexual maturity in fish, see http://icesjms.oxfordjournals.org/cgi/content/abstract/46/3/235</ref> | # The age of onset of [[puberty|sexual maturity]] is rapidly changing, suggesting that life is in a short-term rather than long-term equilibrium.<ref>For evidence of a rapidly changing age for sexual maturity in fish, see http://icesjms.oxfordjournals.org/cgi/content/abstract/46/3/235</ref> |