4. Giant tortoises live over 100 years in the wild and usually do not start to reproduce until around 40

4. Giant tortoises live over 100 years in the wild and usually do not start to reproduce until around 40 years of age. Brown rats only live up to three years and can produce offspring after they are five weeks old. Suppose a brown rat had drifted to the Galápagos Island from the mainland at the same time as the tortoise. In which organism do you think speciation would likely occur first? Why?​

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