what is allergies???
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- Overview. Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or a food that doesn't cause a reaction in most people. Your immune system produces substances known as antibodies.Overview. Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or a food that doesn't cause a reaction in most people. Your immune system produces substances known as antibodies.
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what is vector quantity??
Vector, in physics, a quantity that has both magnitude and direction. ... For example, displacement, velocity, and acceleration are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars.
Name some vector quantity?
Some examples of vector quantities include force, velocity, acceleration, displacement, and momentum.
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