Can someone plz help me with this

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

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis. b. the primary role of microbes on the planet involves causing disease in animals and humans. c. microbes produce vitamins in the intestines. d. microbes play a role in breaking down waste and decomposing dead organisms.

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?