Type o blood is known as the universal donor why is this so?

Because their blood cells could be transfused to any blood type
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People with O negative blood are universal red blood cell donors. This means that their red blood cells can be transfused to any blood type. O negative is the universal donor.

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling