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All of the following are reasons for why psychologists use animals in research EXCEPT
animals' lives are easier to control than the lives of humans.
it is much easier to see the effect of a manipulation in simple animals, like sea slugs or rats, than in humans.
long-term effects are more immediately observed in animals than in humans.
there are no ethical guidelines that need to be adhered to in the case of animal experimentation.
researchers can treat animals in ways that cannot be used to treat humans.