Read the following statements regarding Class Mammalia: A. The most unique mammalian characteristic is the presence of milk producing glands. B. They are homoiothermous and possess a four-chambered heart. C. All mammals are viviparous and show direct development. D. The skin of mammals is unique in possessing hair. How many of the given statements are correct?

Step-by-step solution

Statement A is correct. The most unique mammalian characteristic is the presence of milk producing glands (mammary glands) by which the young ones are nourished. Statement B is correct. Mammals are homoiothermous (warm-blooded) and have a completely four-chambered heart. Statement C is incorrect. While most mammals are viviparous, there are exceptions. Ornithorhynchus (Platypus) is an oviparous (egg-laying) mammal. Statement D is correct. The skin of mammals is unique in possessing hair. Therefore, exactly three st