Physics

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Explanation

F = m a

F – Force

m – mass

a – acceleration

Chemistry

Activity series of metals

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Explanation

Potassium > Sodium > Calcium > Magnesium > Aluminium > (Carbon) >Zinc > Iron > Lead > Hydrogen > Copper > Silver > Gold

Biology

SKILL

Explanation

Excretory Organs of the Body 

S - Skin

K - Kidneys

I - Intestines

L - Liver

L - Lungs