I believe most carnivorous plants evolved while living in areas with depleted soil resources. Presumably, during that time, there was some sort of selection fo

I believe most carnivorous plants evolved while living in areas with depleted soil resources. Presumably, during that time, there was some sort of selection for plant mutants that were slightly more likely to survive because they could absorb nutrients from decaying insects, but without any sort of physical trap mechanism. Then, over time, some small physical mutations showed up (and provided a survival and reproduction benefit)... and ... well, to be honest, speculating about evolution like this is remarkably iffy. But we can speculate they probably happened through modifications of existing plant primitives, like leaf structures. Dawkins made an attempt at it in The Blind Watchmaker. See also https://www.smithsonianmag.com/science-nature/how-carnivorous-plants-evolved-180979697/ https://www.smithsonianmag.com/science-nature/how-carnivorou... and https://www.nature.com/articles/nature.2017.21425 https://www.nature.com/articles/nature.2017.21425