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Covalent molecules come in all shapes and sizes, depending on pairs of electrons in the outer shell, which repel each other due to their negative charge....
Constriction of blood vessels Dilation of pupils Slows down digestion
Central executivePhonological loopVisuo-spatial sketch pad Episodic buffer
This question is suited to A2 maths students, particularly those who are doing further maths and may be looking for a challenge. In one question it tests the students ability to use implicit differentiati...
In the population of a species there will always be a selection pressure (new predator/competitor/ presence of disease) There is genetic variation within the population so new alleles can arise due to ran...
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