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Enzymes are biological catalysts. This means they spead up chemical reactions in the body. To understand why they might stop working, you must first look at the structure. Enzymes are proteins made up of ...

For a reaction to occur between particles (reactants) they must overcome an energy barrier. This is called the activation energy. A catalyst provides an alternative pathway for the reaction, that has a lo...

180-140=40 

40/2 =20

each other angle is 20 degrees

12x^2 +3

Destructive plate margins are those where two plates are moving towards one another. In cases where an oceanic plate and a continental plate converge, the denser oceanic plate will be forced beneath the c...