Joined: Sep. 2009
bjray, I think ogre's list of words to define is a good place to start understanding evolution. I would add another thing: TIME, verry long periods of time.
The universe is 13.5 billion years old. that's 13,500,000,000 years.
The earth is 4.5 billion years old.
The oldest earth rocks so far discovered are 3.8-4.2 billion years old.
Modern humans appeared no more than 200,000 years ago.
We began studying and systematizing biology and geology less than 300 years ago.
On the Origin of species was written 150 years ago.
The dna double helix was discovered 57 years ago.
My point is that we have spent very little time studying a whole lot of time, and have a lot of work still to do.