When a neurotransmitter reaches an excitatory synapse 1 point
Potassium ions moves into the postsynaptic neuron causing hyperpolarization of the
postsynaptic neuron
Potassium ions moves into the postsynaptic neuron causing depolarization of the
postsynaptic neuron on 2
Sodium ions move into the postsynaptic neuron causing hyperpolarization of the
postsynaptic neuron
Sodium ions move into the postsynaptic neuron causing depolarization of the
postsynaptic neuron
rossa synapse
point

Sodium ions move into the postsynaptic neuron causing depolarization of the

postsynaptic neuron

Explanation:

That's the mechanism of action potential generation. Neurotransmitter receptors are connected to sodium channels. When those sodium channels open the cell becomes depolarized(the charges reverse), that means the inside of the cell becomes more positive while the outside becomes negative

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this