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Vaccination is a way of preparing the body's immune system to fight potential infection. By exposing the body to markers of the virus or bacteria, the white blood cells are able to recognise, memorise and...

The null hypothesis:

• States that results are due to chance, and not due a significant effect of the theory/idea the research is testing.

The research hypothesis:

• St...

Humans modify climate to a considerable extent. Modification can be on a variety of scales. Globally, since the turn of the 19th century human activity is believed to have modified the net global temperat...

Gaseous exchange of oxygen and carbon dioxide (diffusion) occurs between the alveoli (tiny air sacs) and capillaries (microscopic blood vessels) inside the lung. Diffusion refers to the passive net moveme...

This is a common question for the native English speaker learning French as it is a concept that isn't so widely used in the English language. The passé composé (perfect) and the imperfect both have speci...