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Acid in stomach kills pathogens in food.Skin creates a barrier that microorganisms cannot enter through.Hairs in nose and ears that trap microorganisms.Mucus and cilia in the trachea and bronchi that trap...

The probability of two events happening is equal to the probability of event 1 times the probability of event 2. Therefore, the probability of both Minnie and Helen scoring a goal is equal to the probabil...

Neither iodine or chlorine have permanent dipoles because there is no difference in electronegativity between the atoms, so there are no permanent dipole : permanent dipole interactions. There are also no...

dy/dx = 34

Firstly, it is important to try to reduce the risk of this happening beforehand by learning as many quotations as possible. A good way to look at it is that no quote you learn will be unhelpful, and every...