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V: There is variation in the ancestors of the lake stickleback. Some have spines, some do not
I: This variation is inherited in the genes.
S: The main predator of the lake stickleback is the dragonfly larva. They hunt by grabbing stickleback spines. This selective pressure favors sticklebacks without spines. They are more likely to survive and reproduce.
T: over many generations...
A: The population of sticklebacks evolve to have no spines as an adaptation to their environment
The End! (until the environment changes...)
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