12.Which of the following feature is correct regarding Aptenodytes: A. Indirect development B. 3- chambered heart C. Presence of mammary glands D. Ossified endoskeleton
Option D An endoskeleton consisting of bones is classified as an ossified endoskeleton. Many organisms have an endoskeleton purely made of cartilage and bones such as birds, bony fish, mammals, and reptiles.
