Which of the following sets of animals exhibit homoiothermy, internal fertilisation, and possess mammary glands?

Step-by-step solution

The characteristics mentioned (homoiothermy, internal fertilisation, and presence of mammary glands) are defining features of the class Mammalia. Let us evaluate the given options: Macropus (Kangaroo) and Camelus (Camel) are mammals, but Psittacula (Parrot) belongs to class Aves. Birds are homoiothermic and have internal fertilisation but lack mammary glands. Ornithorhynchus (Platypus) is a mammal, but Crocodilus (Crocodile) is a reptile (poikilothermic, lacking mammary glands) and Neophron (Vulture) is a bird. Pte