How can we test whether a given trait is adaptive or not? Think about the cost benefits of being a certain body size. A mouse could easily survive a fall of 30 feet, a human would most likely be injured and an elephant most likely killed. A study of bone strength of Tyrannosaurus rex concluded that a fast running T. rex would die from the fall if tripped. Given these costs (and others) why has large body size ever evolved? What are some cost of small body size? How would you test your ideas. Support your understanding with examples.
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