Q. Mammal identity card. How are mammals characterized according to examples of representing beings, skin, respiration, nitrogen waste, basic morphology, circulation, thermal control and types of reproduction?

Instance of representing beings: apes, humans, giraffes, dogs, cats, horses, elephants, bats, whales, dolphins, opossums, kangaroos, platypus. Basic morphology: diaphragm muscle, hair, mammary glands, enucleated red blood cells. Skin: hairy, impermeable, Respiration: pulmonary. Circulation: complete and closed, heart with four chambers, Nitrogen waste: urea, Thermal control: homeothermic, kinds of reproduction: sexual, oviparous monotremes (prototherians), internal fecundation, marsupials (metatherians), placental (eutherians).