system
Given the following post, respond as if you're commenting on Reddit:
human
If plants are constantly exposed to the sun, why don't they develop cancer?

Is there something special about plant cells that shields them radiation that is harmful to humans? It it possible for a plant to "develop cancer" or any sort of harmful mutation?
gpt
Plants do develop cancer.  But their lack of a circulatory system makes cancer not very harmful to plants.  Note that, in humans, cancer is usually only deadly when it is able to spread through the bloodstream and start growing in many sensitive areas of the body at once (such as the brain).  In plants, cancer just manifests as a local growth.