Question
Regeneration.

Answer

(i) Wall lizard breaks up and discards some part of its tail in emergency.
(ii) Discarded part is regenerated after a period. This is an example of limited regeneration.
(iii) However, under certain situation, an animal- planaria breaks up its body into parts and thereafter each part regenerates remaining part of the body and thus new planaria are formed.
(iv) This is called regeneration.

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