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Explain the similarities and differences in Dravidian society before and after the Aryan invasions and the development of the caste system.
Propagation Speed
The rate at which a wave, including sound, light, or electromagnetic waves, travels through a medium.
Action Potential
A brief change in the electrical charge of a neuronal membrane; the physical basis of the signal that travels the length of the neuron.
Excitation Threshold
The voltage difference between a neuron’s interior and exterior that, if exceeded, causes the neuron to fire.
Action Potential
A temporary reversal of electric polarization of the membrane of a nerve cell or muscle cell, involved in the transmission of signals.
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