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What is a hormone?

A hormone is a chemical messenger. Just remembering these two words gives you a starting point to explain the properties of a hormone in as much detail as you need. We'll break it down: A) Chemical: a hormon...
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Answered by Rachel T. • Biology tutor
4837 Views

When and how do I use the product rule for differentiation?

As the name suggests, the product rule is used to differentiate a function in which a product of 2 expressions in x exists. This means the two expressions in x are multiplied by each other, even when the fun...
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Answered by Rachel T. • Maths tutor
12858 Views

What is the difference between unidirectional verbs and multidirectional verbs of motion?

Unidirectional vs multidirectional verbs. Unidirectional verbs (eg. идти) describe movement in one direction, and mostly just a one time movement or a single occasion. Multidirectional verbs (eg. ходить) des...
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Answered by William B. • Russian tutor
7490 Views

I am consistently receiving "A" grades in my essays, how can I push on to the A*?

A grade level answers at A-level tend to travel around the main facets of the question but do not excite the examiner. As i'm sure you've been told again and again, examiners do not spend long on an individu...
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Answered by Cameron L. • Geography tutor
4311 Views

When do I need to use the subjunctive?

The subjunctive is one of the hardest grammar points that you need to tackle in French A level. Any signs that you understand it and can use it confidently will impress the examiner hugely. The subjunctive i...
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Answered by William B. • French tutor
3231 Views