Fill in the table “Features of the internal structure of mammals”.
| October 30, 2020 | Education
| Organ system name | Structural features |
| Respiratory system | Paired alveolar lungs |
| Circulatory system | 2 circles of blood circulation and 4 chambers in the heart. |
| Reproductive system | Uterus in females, testes in males |
| Digestive system | Sufficiently developed intestines, from several sections, developed teeth |
| Excretory system | Presented by paired kidneys |
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