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Why do we wear woollen clothes in winter?

$\begin{array}{1 1} (a)\; \text{to maintain the cold temperature} \\ (b)\; \text{to allow free flow of air} \\ (c)\; \text{to keep ourselves warm. } \\ (d)\; \text{keep us safe from heat, cold, rain, wind, and insect bites. } \end{array}$

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A)
We wear woollen clothes in winter because air is a poor conductor of heat and woollen clothes do not allow the transfer of body heat to the environment and keep us warm. Woolen yarn has large amount of air trapped between its crimps.
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