Top answers

How do I figure out which case to use?

As an English speaker, a language that no longer uses cases, it can be really tricky to get to grips with the German case system. But once you start practising, you'll find it's not as horrible as you think!...
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Answered by Kate C. • German tutor
3834 Views

How does a vaccine work?

A vaccine contains a dead or inactive (an therefore harmless) form of a pathogen. By injecting this into the body, an immune response is triggered and white blood cells produce antibodies specific to the ant...
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Answered by Tianna P. • Biology tutor
5900 Views

What do the numbers mean at the side of an element in the periodic table?

The top number is the total mass number, particles in an atom of an element that have mass are protons and neutrons. So the top number tells us how many protons and neutrons there are in an atom of that elem...
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52534 Views

How do bacteria develop antibiotic resistance?

So when we give an antibiotic (a drug that kills bacteria) it will kill all of the bacteria that are sensitive to it, if it's taken correctly. A few bacteria may have an adaptation allowing them to resist an...
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Answered by Charlotte N. • Biology tutor
3847 Views

Solve the simultaneous equation: 2x + y = 7 and 3x - y = 8

The aim of this maths question is to find the two unknowns, x and y, by using simultaneous equations. Simultaneous equations can be solved by either using the elimination method or the substitution method. T...
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Answered by Oscar G. • Maths tutor
16300 Views