Which one of these is not an example of intracellular communication?

a. a signal is translated to cause a muscle to contract.

b. chemical messengers dock onto receptors of adrenal gland.

c. water regulation by a cell's central vacuole.

d. charged ions distributed across a plasma membrane.

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.