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How to use primary sources.

In history you have no doubt come across, and had to use primary sources. Primary sources offer a wealth of information, but they do have their limitations. There are a number of reasons why you cannot ta...

JL
Answered by Jason L. History tutor
3674 Views

What is the difference beween biological species concept and the phylogentic approach to defining species?

 

The biological species concept classifies species as a group of actually or potentially interbreeding individuals. This means that any two individuals (well a male and female) within the gro...

HH
Answered by Harriet H. Biology tutor
26555 Views

What is chirality/optical isomerism?

Chirality (or optical isomerism) is a physical property of a molecule which has a non-superimposable mirror image. In other words, a molecule which, when reflected cannot be rotated in any way to make the...

MW
Answered by Matthew W. Chemistry tutor
13489 Views

When do you use the imperfect and when do you use the preterite?

Trying to differentiate between the use of these two tenses can often prove challenging for Spanish students. However, there are some key points that may help ...

SS
Answered by Summer S. Spanish tutor
3857 Views

What is the difference between "ce" and "se"?

Nothing can distinguishes se and ce when you hear them. However, they have completely different meanings:

    - you will always find 

DS
Answered by Domitille S. French tutor
19237 Views

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