Evolution is no more complicated than genetic changes accumulating through time. Sounds almost boring, yet it's anything but boring. Because all those changes in the DNA, which you can't even see (outside a biology lab) influence all the things about living creatures that you cannot only see, but also be amazed by. Look out the window at nature's diversity: Evolution did that! Evolution has a pretty big impact on lots of things you can observe about life, such as:
^ Physical characteristics (petal color, length of tail, eye color, and so on) ^ Body shape (number of fins, fingers, limbs, and heads, for example) ^ Sexual selection (who mates with whom, how, and why) ^ Life histories (reproduction and life spans) ^ Social behaviors (competitive, altruistic, and so on)
This part covers 'em all.
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