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The subjunctive mood is a very useful (and impressive!) tense to use when writing and speaking and it enables you to express yourself in many more ways, but it is difficult sometimes to get your head arou...

First of all, "second derivative", d²y/dx², is what you get when you differentiate the first derivative (dy/dx).

The second derivative can be used as an ea...

Always begin answering questions by providing a definition. This is key in economics. Therefore, start by explaining that the national min. wage is the governments guarentee of a minimum wage per hour ...

Temperate deciduous woodland is found between the latitudes of 40 and 60 degrees north and south of the equator. It is a high energy biome, meaning it has a high level of productivity and exists in a s...

Allergy is the result of the immune system overreacting to harmless stimuli in the environment.

Examples of stimuli or 'allergens' include pollen, dust, eggs and milk.

The b...