2. why is the kingdom protista not valid under evolutionary classification? (1 point)
protists are all very similar and easy to confuse.
protista contains groups that share closests common ancestors with other groups, rather than with each other.
protists are the most numerous organisms on earth.
protista evolved before any other kingdom, and as such share a most recent common ancestor with each other, as opposed to any other group.

The best and most correct answer among the choices provided by your question is The best and most correct answer among the choices provided by your question is the last choice.

Kingdom Protista is not valid under evolutionary classification because they evolved before any other kingdom, and as such share a most recent common ancestor with each other, as opposed to any other group.

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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.