What is the effect of alcohol administration on the frequency of Daphnia heart contractions and how does this effect of alcohol change with the dose of alcohol applied?

to prevent bacteria and viruses

option a is correct i.e.

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.

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