Question

regeneration in nature

Answer 1

Regeneration is the process by which woodlands are restocked by trees that develop from seeds that fall and germinate in situ.
For most of the last two or three centuries foresters have restocked and created woodlands by using transplants grown in nurseries

Answer 2

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Regeneration:

Regeneration is the process of growing back the lost organ or body part by theorganism

(e.g. Lizard).