Runners from plants such as strawberries extend towards the ground. They then specialise into specific cells such as root cells and a whole new plant develops.
There are artificial methods also such as cuttings:
A branch is cut off from a plant and the leaves are removed. It is then placed in soil and covered in a CLEAR plastic bag to retain the warm temperature and keep it moist. After a few weeks, new roots develop and a new plant begins to grow.
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