A) Single systemic arch
B) Metaneptiric kidney
C) Seven cervical vertebrae
D) Homiotherms
Correct Answer: C
Solution :
Seven cervical vertebrae are present in the neck of mammals. The first is called atlas and second axis. The axis has a peg like process called the odontoid process. The kidney are metanephric in both birds and mammals. In metanephric kidney tubules (nephrons) are large in number. The glomeruli are very well developed. In homoiothermic animals (warm-blooded animals) the body temperature is independent of their external environment e.g., Birds, mammals. Three aortic arch persist in the adult mammals, these are carotid arteries, pulmonary arch and the systemic arch. The left systemic arch is predominant in mammals while right systemic arch in birds.
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