why do things change over time
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why do things change over time
why do living things change over time
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how do people change over time
why do we have time changes
things a person can change over time
how has it changed over time
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why do things change over time, why do living things change over time, things that changes over time, things that change over time, how things have changed over time, what can change over time, how do people change over time, why do we have time changes, things a person can change over time, how has it changed over time, why do the time change, why does my time keep changing, can facts change over time, why does time change happen