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#1 Answer: Because Lymphatic System protects our body from different infection and it defenses our immune system.
#2 Answer: Circulatoty System circulates blood through the whole body, carry waste throughout the body fluids, and protects our body form infections.
#3 Answer: We must prevent eating oily and fatty foods, and must exercise regularly for the normal circulation of blood. Eating healthy foods such as dark-green leafy vegetables can also help to maintain healthy blood.
#4 Answer: For the circulation of body fluids and oxygen (and other body components) of our heart and lungs (and also for the whole body).

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