Today we started our adaptation unit by talking about genetic variation within a species.....
For example,
Even within humans, there is a definite difference between people. Some are faster, some have a different hair/ skin color, and some are better at holding their breath.
Apply this to a situation where some humans have an advantage surviving ( faster humans can run away from predators etc.) and you can see how some traits cause animals to pass on that DNA to future generations and some DNA (slow people get eaten) cause itself to NOT be passed on to the next generation.
Apply this over millions of years and you have our next unit.
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