Natural Selection. The Theory of …. VARIATION WITHIN POPULATIONS. Consider individuals from the same species. Within a giraffe population some giraffe’s will be born with longer necks than others. For example consider two different giraffes, one with a longer neck than the other.
The Theory of …..
Who will survive?
Those that survive can go on to reproduce
What type of neck will be likely to be passed on?
Coined by Herbert Spencer
http://www.youtube.com/watch?v=tJ32_ijdmLo –bower bird