forest or woodland having a mature or overly mature ecosystem more or less uninfluenced by human activity
(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
a progression from simpler to more complex forms
a process of becoming larger or longer or more numerous or more important
vegetation that has grown
the gradual beginning or coming forth
of long duration; not new
(used especially of persons) having lived for a relatively long time or attained a specific age
skilled through long experience
