Every experiment is done under a particular set of conditions and the conclusions are only valid for that set of conditions. If you repeat an experiment you don't reach exactly the same conclusions (the data won't be exactly the same) so you have to look at the detail of the conditions to...
In the UK, a scientist proposing an experiment involving live animals must submit the aims, the rationale and the fully-detailed protocol to an ethical commitee.
The proposal must justify why the question needs to be answered and why it cannot be answered without recourse to experimenting on a...