Sodium ions move into the cells, and the cells get a

facilitated diffusion.

Explanation:

Sodium ions pass through specific channels in the hydrophobic barrier formed by membranes proteins. this means of crossing the membrane is called facilitated diffusion, because the diffusion across the membrane is facilitated by the channel. in this case, sodium must move, or be pumped, aganist a concentration gradient.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.