Which ion most readily leaks across a neuron's membrane, to establish the resting potential?

 Mainly sodium and potassium. Though chloride and calcium are also used in special circumstances. In the normal resting potential, the cell must bail out sodium ions that leak in and recapture potassium ions that leak out remains stable because the ionic concentration gradients are maintained.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.