What two molecules can not pass through the membrane

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

What happens during the experiment stage of the scientific method