Final answer:
Extensible cheek pouches are adaptations found in monkeys, squirrels, and hamsters, therefore, the answer is 'All of the above'. (option 4)
Step-by-step explanation:
Extensible cheek pouches are adaptations found in a variety of mammals that allow these animals to carry food items while they forage. These specially adapted pouches are present in several groups of animals, including monkeys, squirrels, and hamsters. Hence, the answer to the question 'Extensible cheek pouches are adaptations found in?' is '4) All of the above'.
Examples of these animals with cheek pouches include some New World monkeys like the spider monkey, rodents like squirrels that use these pouches to store nuts, and hamsters which are well-known for stuffing their pouches with seeds and other food items to transport them to their dens.
Hence, the answer is option d