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A quadratic equation is an equation of the form y = ax² + bx + c where a, b and c are constants (for example 5, -2 or 0). To "solve&qu...

When preparing for an essay question that is based on an unseen text, many students see this as a daunting concept, as I did when studying for my A levels too! However, in reality, you will know the te...

The fossil record provides a comprehensive array of evidence for evolution. For example Darwin studied Brachiopods, and within rocks you can see the clear change in the Brachiopods through time. The fo...

Pathogens are first recognised as a foreign body by the antigens on it's membrane, as they are non-self antigens. The body then triggers a response by attaching antibodies to these antigens. Phagocytes...

The DNA molecule is found within the nucleus of the cell, organised into chromosomes. In humans, there are 46 chromosomes. The DNA molecule consists of organic bases joined by sugars and phosphate mole...