What differentiates the isotopes of an element? number of protons number of neutrons number of electrons atomic number

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

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)

Archaebacteria use for movement. celia flagella pili cell walls