D Match the following column A with column B.
Column A
Column B
1. Brain
(a) thread like structures
2. Nerve cells
(b) protected by the backbone
3. Spinal cord
(c) involves only nerves and spinal cord
4. Skull
centre of the nervous system
5. Reflex action
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Wed's ddfvxxsdghvxdrth gdfffffffgcfffgyhhcdf ddgjjhhgccd
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