Why Mammals are so unique?
In the following text, the question Why mammals are uniques? has been addressed.Â
- Few or many hairs on their bodies.
- Skin having some modifications, bearing hairs, glands like sebaceous, sweat, and mammary.
- The three smallest bones of the ear namely; the malleus, incus, and stapes, collectively the ossicles.
- Two occipital condyles in their skull.
- Seven vertebrae in their cervical region.
- Presence of fuse pelvic bones.
- They are diphyodont because they bear two sets of teeth, milk, and permanent teeth.
- Eyelids are movable.
- Pinna is the outer fleshy and visible part of the ear.
- The presence of four limbs, modifies in some cases, performing many functions.
- Four chambered hearts.
- The red blood cells have no nucleus and are biconcave in appearance.
- Voicebox is present and a secondary palate besides the primary palate.
- The presence of a muscular diaphragm.
- The kidneys are metanephros kidneys, the opening of ureters into the urinary bladder.
- Highly developed brain, neocerebrum especially, and, presence of twelve pairs of cranial nerves.
- They are endothermic and homeothermic status.
- Mammals have separate sexes.
- The fertilization is internal. Implantation of embryo happens into the uterus and there is the presence of the placenta.
- Presence of fetal membranes known as amnion, chorion, and allantois.
- The mother nourishes young ones with milk from their mammary glands until they are able to eat other foods.
- The horns are made of keratin present on their heads.
- The three horns namely; true horns, antlers, and rhinoceros horns.
- The presence of four types of integumentary glands, sweat, sebaceous, scent, and mammary.
These all are the unique characters that clearly describe the class Mammalia.
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