Definition: Regrowth refers to a biological process in which an organism reproduces itself by growing new tissue or organs from its existing tissues. This can occur naturally through cell division, but it can also be caused by external factors such as infection, trauma, or environmental stressors. For example, the plant "Datura" is known for regrowing shoots after being cut off during a winter freeze. The shoot continues to grow and produce new tissue as if it had never been cut off, demonstrating regrowth in