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To what extent was the 'Abbasid Revolution of 747 a Shi'ite movement?

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...

Answered by • History tutor

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Define the different types of reproduction and list the advantages of each type of reproduction.

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...

Answered by Lucy M. • Biology tutor

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Describe what happens at a synapse.

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...

Answered by dana A. • Biology tutor

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What are the 3 main types of chemical bonding? Give definitions of them.

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

Answered by • Chemistry tutor

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How does the reflex arc work without going to the brain?

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...

Answered by Armaan G. • Biology tutor

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