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(The Digestive System, The circulatory system, The excretory system, The…
The Digestive System
The Oesophagus
The mouth
The stomach
The intestines
The circulatory system
The heart
circulation
Blood vessels
Blood
The excretory system
Dialysis and transplants
the urinary system
sweat glands
The Respiratory System
Breathing in and out
Respiration
