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25. If the head of cockroach is removed, it may live for few days because:

the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
the cockroach does not have nervous system.
the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
the head holds a \(1/3^r\)\(^d\) of a nervous system while the rest is situated along the dorsal part of its body.

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