Which of the following organisms possesses dry skin without any glands, except for an oil gland at the base of the tail?

Step-by-step solution

The presence of dry skin without glands, except for an oil gland at the base of the tail, is a defining characteristic of Class Aves. Aptenodytes (penguin) belongs to Class Aves and exhibits this feature. Chelone (turtle) belongs to Class Reptilia, which has dry and cornified skin with epidermal scales or scutes but lacks an oil gland. Macropus (kangaroo) belongs to Class Mammalia, which typically has glandular skin containing sweat and sebaceous glands. Bufo (toad) belongs to Class Amphibia, which has moist skin w