se·lec·tion·ist 
(sĭ-lĕkshə-nĭst)
(sĭ-lĕkshə-nĭst)n.
One who believes that evolution occurs chiefly as a result of natural selection.
se·lection·ism n.
se·lection·ist adj.
- keenly
- keenness
- keep
- keepan ear to the ground
- keep an eye on
- keep an eye out
- keep a/one's weather eye open
- keep a stiff upper lip
- keep at
- keep a weather eye open
- keep chin up
- keep company
- keep company
- keep down
- keep end up
- keeper
- keep eyes open
- keep eyes peeled
- keep fingers crossed
- keep head
- keep/hold (one's) peace
- keeping
- keep/know (one's) place
- keep kosher
- keep nose clean