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The 'Abbasid revolution can be most strongly argued to have been a proto-Shi'a revolution wherein notions of the primacy of the family of prophet were emerging against the backdrop of civil unrest and dis...

Asexual reproduction: only needs one parent and uses the process of mitosis to create identical copies (clones) of the parent cellSexual reproduction: two parents are needed in sexual reproduction and use...

An action potential (electrical impulse) arrives at a synapse (a gap between two neurones) which causes calcium voltage-dependent gates to open in the presynaptic neurone. An influx of calcium ions trigge...

IonicCovalentMetallic
Ionic bonding The electrostatic attraction between positive and negative ions 
Covalent bonding Electrostatic attraction between a shared pair of electrons and the nuclei <...

The reflex arc is designed for quick, reactive movements that are instinctive. E.g. when we touch a hot pan, we need to react quickly otherwise our hand will get really badly burned. If the signal went fr...