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A population of one species is separated by a physical barrier, e.g a geographical barrier such as the movement of tectonic plates. There will then be 2 isolated groups of the same species unable to inter...

Plant cells have chloroplasts, a vacuole and a cell wall.

Nucleus, mitochondria, ribosome, cytoplasm, cell membrane. 

The citric acid cycle (AKA the TCA cycle, AKA the Krebs cycle) is an incredibly important set of chemical reactions which is at the centre of how all aerobic organisms function. It is ...

Randomised controlled trials are the most important way that new medical therapies (drugs, devices, procedures and so on) are tested.

‘Controlled’ means that volunteers i...