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What are pathogens and how do they cause disease?

Pathogens are microorganisms that can cause disease. Pathogenic bacteria make us ill in 2 way: 1) by damaging body cells 2) releasing toxins. Pathogenic viruses invade body cells where they use the cellular ...
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Answered by Golnoush G. • Biology tutor
14955 Views

What are some simple but effective phrases using the subjunctive?

The subjunctive as a mood, not a tense, is often instigated or prompted with the usage of preposition 'que'. Some common and simple phrases include:- Que yo sepa- Es posible que- Para que- Espero que
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Answered by Anneli A. • Spanish tutor
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What is a reflex arc and how does it work?

A reflex is an unconcious response to a potentially harmful stimulus, such as pulling a tray out of the oven without oven gloves on! Reflexes bypass the brain and instead have a circuit that only passes thro...
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Answered by Polly C. • Biology tutor
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Find the exact gradient of the curve y=ln(1-cos2x) at the point with x-coordinate π/6

This is a past paper question for an A level OCR MEI paper for Maths.We need to find the gradient of the curve so we know right away that we need to use differentiation.The equation y = ln(1-cos2x) is diffic...
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Answered by Catherine H. • Maths tutor
14880 Views

How can I derive an equation to find the sum of an arithmetic sequence?

This isn't a requirement of many courses but understanding and proving mathematics has order is what makes mathematics unique and enjoyable to many. Imagine the sum of a sequence with n terms, denoted S n , ...
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Answered by Rhys H. • Maths tutor
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