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what is immunity? no google answers put it in your own words. 2 sentences.

immunity is the ability of an organism to resist to a particular  disease that it have penetrated the first like of the fence of our body . there is two types of immunity positive and active which develop during your life time ,active immunity is when you have a infection and positive immunity develop when you revise antibodies .

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate