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Here are some sea turtles millions of years ago.
Most of them can retract their heads, but some cannot.
Even though one turtle cannot retract its head, the shell shape helps it go much faster.
These turtles catch food easier and escape predators better because of their speed.
More of these turtles survive compared to the other turtles.
Today, we have sea turtle whose shells do not allow them to retract their heads. Luckily, their stream-lined shells help them go faster.
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