When a stimulus reaches the thresholdin the plasma membrane open. Sodium bannel

led ne channel

Potassium channel

Calsam channel

Answer and I will give you brainiliest
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The earth's polarity has switched many times through history as evidence by what wh the earth clorets he has switched many times throughout history as evidence by what

Does the sun release radiant energy?

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve