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Did you know there used to be different kinds of turtles at this pond?
Turtles with shorter legs.
What kinds of other turtles?
Yup. But there was also a lot more competition. There were limited resources, and the turtles with shorted legs couldn't always get to them.
Sounds like here used to be a lot more natural variation and diversity at this pond.
So over time, we all evolved to have longer legs.
And now the whole population has longer legs.
Even though these other turtles were different from us, we know that we evolved from the same ancestors.
We know that they had similar DNA to us, and their fossils look like us.
How do we know that?
Wow! Maybe someday we will evolve to be super turtles!