Question

Observe the flowchart and fill the part 'X'.
Body organs
X
Gills​

Answer 1

Answer:

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Answer 2

The organ X is the heart.

• The fish heart only has one atrium and one ventricle.

• The deoxygenated blood from the body enters the atrium of the heart and then the ventricle.
• The blood passes through the gill capillaries. The waste gases are given off to the environment, and oxygen is absorbed in the gills
• Then the oxygenated blood is again distributed through the whole body.