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The respiratory system is a collection of organs working together in order to oxygenate the blood and remove the waste product carbon dioxide. The respiratory system uses a method of gaseous exchange ...

Primary sources are a key part of the historians work and will provide important points that will strengthen your argument. However primary sources are often d...

The grammatical aspect indicates whether an action is/was completed or not. 

The perfective aspect (as in aorist, aorist infinitives) shows that the action was completed, often that it was a s...

Set f(x) = y. Then rearrange your equation to find x on it's own as some function of y. If you have a x term on both the top and bottom of a fraction then you will have to multiply the whole equation ...

Evolution is a gradual change in the inherited traits of a population over many generations. 

Natural selection is a mechanism where the members of a population best suited to their environmen...