BIOXI04: ANIMAL KINGDOM
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All mammals, without any exception, are characterised by
1 Extra -abdominal testes and a four chambered heart
2 Viviparity and biconcave red blood cells
3 A muscular diaphragm and milk producing glands
4 heterodont teeth and 12 pairs of cranial nerves
Explanation:
All mammals are characterised by a muscular diaphragm and milk producing glands, without any exception.