Venom isn't solely used to catch prey but for self defense as well, and when every other predator or threat around you is venomous, one needs to evolve their potency to stay safe. Also in same environment, potential preys would've evolved immunity to venom as well, thus triggering the need for more potent venom.
Quote:To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.
- Lau Tzu
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