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To what extent did US presidents hinder African American civil rights from 1865 to 1992?

Huge change occurred in regards to African American civil rights at the hands of US presidents from 1865 to 1992. These can be catagorised into social, political and economic spheres. Where one president ...

SM
Answered by Sky M. History tutor
9348 Views

How does vaccination work?

Vaccines contain weakened (or attenuated) antigens which cause immunity to a disease without actually giving the person the disease. They are usually adminstered by injection or sometimes orally (by mouth...

LG
Answered by Lizzy G. Biology tutor
7114 Views

How are action potentials propagated across cholinergic synapses?

In order for action potentials to travel to their intended destination they must cross synapses. These synapses are the spaces between neurones' axon terminals 

HS
Answered by Harry S. Biology tutor
3071 Views

Given that y=sin2x(3x-1)^4, find dy/dx

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