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The lungs are made up of tiny sacs called alveoli which presents a very large surface area for gaseous exchange. The lungs are well supplied with blood due to lots of capillaries covering the alveoli, ...

Prepositions that trigger the dative case in German are mit, nach, seit, von, zu, aus, außer, and gegenüber.

Organisms, such as humans, take in "substrates" such as glucose, in our food.  During a process called respiration, we react these substrates with oxygen to give carbon dioxide and water; thi...

Usually, in Italian masculine nouns end with an "o" whereas feminine nouns end with an "a". For instance, a masculin noun would be "tavolo", which means table, and a feminine...

Factorising equations:

Lets look at the example:   Factorise 3x+21 

In order to factorise this equation, we need to find a common factor of both 3x and 21. ...