Fill in the table “Internal structure of arthropods”.

Organ system Structural features
Circulatory system Open
Nervous system Periopharyngeal nerve ring and abdominal nerve cord
Excretory system Green glands in cancer, kidneys
Reproductive system Male and female gonads
Digestive system Mouth, pharynx, esophagus, stomach, intestines, anus
Respiratory system Gills, pulmonary sacs, trachea
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