Final answer:
c) Some cloned animals have had lifespans that are much shorter than normal. The disadvantage of cloning animals is that some cloned animals have shorter lifespans than normal.
Step-by-step explanation:
Cloning animals has both advantages and disadvantages. In this case, the correct answer is c) Some cloned animals have had lifespans that are much shorter than normal. This is a disadvantage of cloning animals because it means that the cloned animals may not live as long or be as healthy as naturally bred animals.
One example of this is Dolly the sheep, the first cloned animal, who lived for only seven years and died of respiratory complications. Other cloned animals, such as horses, bulls, and goats, have also been found to exhibit facial, limb, and cardiac abnormalities.