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Oxygen moves via diffusion from the alveoli in the lungs where there is a high concentration of oxygen, into the blood where there is a low concentration of oxygen - it moves down its concentration gradie...

The essay section is split into 3 individual questions. These 3 questions will be worth 20 points altogether, out of which 2 points will be awarded for the quality of your writing, i.e. hand-writing, gram...

Dead leaves fall from plants to the ground. These leaves contain carbon. They are digested by microorganisms like bacteria which take up carbon and then respire it into the atmosphere. Plants are autotrop...

To answer this question, I would definitely use a diagram so that they can clearly see that this is a cycle and it will probably then use the diagram to explain each step. The Photosynthesis equation CO2 ...

Firstly, humans have a double circulatory system, which increases blood pressure and flow of blood to the tissues. To allow the heart to pump blood around the body, the heart is made of cardiac muscle. Th...