What type of cave material dissolves with water?

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

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

If the frequency of the p allele is .63 in the population then what is the frequency of the q allele?