Does eating before bed increase colestral

Yes, but it depends on what kind of foods you eat.
                          Hope this helps.
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option a is correct i.e.

only sodium ions can pass through the membrane.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

The answer should be geothermal i hope i’m right message me if i’m wrong and i’ll change my answer and fix it for you