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diffusion is the movement of particles from a high concentration to a low concentration through a semi permeable membrane. an example would be the movement of food molecules through the gut wall as they p...

risk factor is something which increases your chance of developing a particular disease.  risk factor of coronory heart disease is diet due to the atheroma developed from the fatty material deposited in t...

eutrophication is whereby excess feriliser from farmland has run off into areas of water such as lakes or rivers. algae growth is promoted due to the rise in phosphates. in turn  the remaining oxygen in t...

Total sales abroad: 20000 x 4 euros = 80000 euros Pound amount = Euro amount x ER Before ER change: 80000 x1.13 =90400 pounds After ER change: 80000 x 1.08= 86400 pounds 864-904 = -4000 pounds Therefore, ...

We firstly need to look how to factorise quadratics. (x    )(x    ) By looking at this, we need 2 numbers that add together to make -1. We need 2 numbers that multiply to make -6. To multiply to make -6, ...