Struggling with your prescribed literature?
Our Literature Study Guides provide insights and analysis of themes and characters and includes guidelines for writing your exam.
a form of potential energy stored in chemical bonds and released in a chemical reaction.
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
a molecule that is formed when oxygen and haemoglobin combine chemically.
is the supply of materials, in the form of food, required by organisms and cells to stay alive...