Other Examples
Stickleback fish have both marine and freshwater species, the freshwater species evolving since the last ice age. Fresh water species can survive colder temperatures. Scientists tested to see if they could reproduce this evolution of cold-tolerance by keeping marine sticklebacks in cold freshwater. It took the marine sticklebacks only three generations to evolve to match the 2.5 degree celsius improvement in cold-tolerance found in wild freshwater sticklebacks.
Read more about this topic: Experimental Evolution
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