With the help of your parent/ family member, think of a tool or material from the list which can have an alternative and what can be its replacement? Explain briefly how it can replace the original.
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now:brush. a normal toothbrush
replacement: now a days we use a brush that does not clean the teeth properly. so i learnt that we use a stem and a type of a fur on the tip of the stem. it is used a long ago, maybe it is from stone age.
hope this helped you.
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