blood donation
Your kidneys filer your blood of nitrogenous wastes. These wastes are then moved to the bladder in the form of urine and expelled.
The pumping of the heart keeps the blood moving
The spleen acts as a filter for your blood, cleansing it of bacteria, viruses and other debris. When blood flows through your spleen, white blood cells attack and remove any foreign invaders. This keeps your blood clean and helps protect you against infection.
the mother licks the children clean
it keeps the pool clean
it keeps your teeth clean
it keeps our air clean
The council usually.
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