system
Given the following post, respond as if you're commenting on Reddit:
human
Could there ever be a situation where a poisonous/toxic creature could be harmed/killed by its own poisons/toxins?
gpt
The first green plants appeared in a world were oxygen was toxic to all life. The geological record shows that green plants would periodically wipe themselves out if they were too successful and oxygenated the Sea water. One day a sufficiently mutated plant appeared that could survive it's own toxic oxygen, causing the first great extinction event on Earth.