"But wait," you might be saying, if you know anything about ants and plants. "Don't ants destroy plants, because they eat the leaves and scare away helpful insects?" The answer is that they would, if it weren't for the aforementioned mind-control thing that the plant has going for it. When it needs to, the acacia can also produce a different chemical, which attracts pollinating bees to help it reproduce. It also totally repulses the ants, allowing its flowers to bloom in peace.
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"Kinda getting a few mixed signals over here, sweetums."
Once the pollination is complete, the acacia takes the chemical lock off the door and invites the junkie ants back into its crack house of horrors. Mother nature, everyone!