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Analyze the assertions and choose the RIGHT alternative.
I. In the past, insulin was artificially produced from animals such as pigs and cows. II. Today oxen and horses are often used for agricultural, travelling, horseback riding and racing purposes III. Doctors can still prescribe animal insulin. IV. A sick child can improve his/her mood by caressing a poney. V. Many plants are no longer pollinated because many animals have become extinct.