Fill in the table “Features of the internal structure of birds.”

Organ system name Structural features
Respiratory system In addition to lungs, birds have pulmonary sacs, which provide double breathing.
Circulatory system Birds have 2 circles of blood circulation and 4 chambers in the heart.
Reproductive system The reproductive system of the female has an oviduct through which the egg goes
Digestive system Birds have several stomachs: glandular and muscular
Excretory system Represented by the kidneys
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