Question

give reasons: we do not sense any pain when we clip our nail or cut our hair

Answer 1

There will be nerve cells in the nerves. ... But here these nerves were not present in the fingernails and hair. So that, ourbrain can't sense the pain, which has occurred due to any disturbance in their structure. We also don't feel any pain while they undergo to cutting by a nail cutter or the scissors.
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Answer 2

They are made up of dead cells