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A single species of fish, the three-spined spinyback, once inhabited a large lake.

A single species of fish, the three-spined spinyback, once inhabited a large lake. At some point in the lake's history, lava flowed from a nearby volcano into the lake cutting it into three completely isolated mini-lakes. Despite the heat from the lava, a few individuals from the original population of spinyback survive in each mini-lake. Three million years later, a researcher finds that each mini-lake is inhabited by its own species of spinyback. Which of the following figures most closely reflects how the three species of spiny back are related to one another?


tree M

tree H

tree K

tree Lspinyback_homework.png

spinyback_homework.png

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